2005-11-10 08:25:51 +07:00
|
|
|
/*
|
|
|
|
* NETLINK Netlink attributes
|
|
|
|
*
|
|
|
|
* Authors: Thomas Graf <tgraf@suug.ch>
|
|
|
|
* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
|
|
|
|
*/
|
|
|
|
|
2011-11-17 09:29:17 +07:00
|
|
|
#include <linux/export.h>
|
2005-11-10 08:25:51 +07:00
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/errno.h>
|
|
|
|
#include <linux/jiffies.h>
|
|
|
|
#include <linux/skbuff.h>
|
|
|
|
#include <linux/string.h>
|
|
|
|
#include <linux/types.h>
|
|
|
|
#include <net/netlink.h>
|
|
|
|
|
2016-11-19 07:59:07 +07:00
|
|
|
static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = {
|
2005-11-10 08:25:51 +07:00
|
|
|
[NLA_U8] = sizeof(u8),
|
|
|
|
[NLA_U16] = sizeof(u16),
|
|
|
|
[NLA_U32] = sizeof(u32),
|
|
|
|
[NLA_U64] = sizeof(u64),
|
2011-11-03 07:07:32 +07:00
|
|
|
[NLA_MSECS] = sizeof(u64),
|
2005-11-10 08:25:51 +07:00
|
|
|
[NLA_NESTED] = NLA_HDRLEN,
|
2012-08-26 05:47:57 +07:00
|
|
|
[NLA_S8] = sizeof(s8),
|
|
|
|
[NLA_S16] = sizeof(s16),
|
|
|
|
[NLA_S32] = sizeof(s32),
|
|
|
|
[NLA_S64] = sizeof(s64),
|
2005-11-10 08:25:51 +07:00
|
|
|
};
|
|
|
|
|
2017-07-31 00:24:49 +07:00
|
|
|
static int validate_nla_bitfield32(const struct nlattr *nla,
|
|
|
|
u32 *valid_flags_allowed)
|
|
|
|
{
|
|
|
|
const struct nla_bitfield32 *bf = nla_data(nla);
|
|
|
|
u32 *valid_flags_mask = valid_flags_allowed;
|
|
|
|
|
|
|
|
if (!valid_flags_allowed)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/*disallow invalid bit selector */
|
|
|
|
if (bf->selector & ~*valid_flags_mask)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/*disallow invalid bit values */
|
|
|
|
if (bf->value & ~*valid_flags_mask)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
/*disallow valid bit values that are not selected*/
|
|
|
|
if (bf->value & ~bf->selector)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-11-17 00:52:32 +07:00
|
|
|
static int validate_nla(const struct nlattr *nla, int maxtype,
|
2007-06-06 02:38:30 +07:00
|
|
|
const struct nla_policy *policy)
|
2005-11-10 08:25:51 +07:00
|
|
|
{
|
2007-06-06 02:38:30 +07:00
|
|
|
const struct nla_policy *pt;
|
2007-09-12 19:44:36 +07:00
|
|
|
int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2007-09-12 19:44:36 +07:00
|
|
|
if (type <= 0 || type > maxtype)
|
2005-11-10 08:25:51 +07:00
|
|
|
return 0;
|
|
|
|
|
2007-09-12 19:44:36 +07:00
|
|
|
pt = &policy[type];
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
BUG_ON(pt->type > NLA_TYPE_MAX);
|
|
|
|
|
2006-08-27 10:11:47 +07:00
|
|
|
switch (pt->type) {
|
|
|
|
case NLA_FLAG:
|
|
|
|
if (attrlen > 0)
|
|
|
|
return -ERANGE;
|
|
|
|
break;
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2017-07-31 00:24:49 +07:00
|
|
|
case NLA_BITFIELD32:
|
|
|
|
if (attrlen != sizeof(struct nla_bitfield32))
|
|
|
|
return -ERANGE;
|
|
|
|
|
|
|
|
return validate_nla_bitfield32(nla, pt->validation_data);
|
|
|
|
|
2006-08-27 10:11:47 +07:00
|
|
|
case NLA_NUL_STRING:
|
|
|
|
if (pt->len)
|
|
|
|
minlen = min_t(int, attrlen, pt->len + 1);
|
|
|
|
else
|
|
|
|
minlen = attrlen;
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2006-08-27 10:11:47 +07:00
|
|
|
if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL)
|
|
|
|
return -EINVAL;
|
|
|
|
/* fall through */
|
|
|
|
|
|
|
|
case NLA_STRING:
|
|
|
|
if (attrlen < 1)
|
|
|
|
return -ERANGE;
|
|
|
|
|
|
|
|
if (pt->len) {
|
|
|
|
char *buf = nla_data(nla);
|
|
|
|
|
|
|
|
if (buf[attrlen - 1] == '\0')
|
|
|
|
attrlen--;
|
|
|
|
|
|
|
|
if (attrlen > pt->len)
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
|
2007-03-24 01:37:48 +07:00
|
|
|
case NLA_BINARY:
|
|
|
|
if (pt->len && attrlen > pt->len)
|
|
|
|
return -ERANGE;
|
|
|
|
break;
|
|
|
|
|
2007-06-26 03:49:35 +07:00
|
|
|
case NLA_NESTED_COMPAT:
|
|
|
|
if (attrlen < pt->len)
|
|
|
|
return -ERANGE;
|
|
|
|
if (attrlen < NLA_ALIGN(pt->len))
|
|
|
|
break;
|
|
|
|
if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN)
|
|
|
|
return -ERANGE;
|
|
|
|
nla = nla_data(nla) + NLA_ALIGN(pt->len);
|
|
|
|
if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN + nla_len(nla))
|
|
|
|
return -ERANGE;
|
|
|
|
break;
|
2008-11-28 18:05:19 +07:00
|
|
|
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;
|
2006-08-27 10:11:47 +07:00
|
|
|
default:
|
|
|
|
if (pt->len)
|
|
|
|
minlen = pt->len;
|
|
|
|
else if (pt->type != NLA_UNSPEC)
|
|
|
|
minlen = nla_attr_minlen[pt->type];
|
|
|
|
|
|
|
|
if (attrlen < minlen)
|
|
|
|
return -ERANGE;
|
|
|
|
}
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
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
|
2017-04-12 19:34:07 +07:00
|
|
|
* @extack: extended ACK report struct
|
2005-11-10 08:25:51 +07:00
|
|
|
*
|
|
|
|
* Validates all attributes in the specified attribute stream against the
|
|
|
|
* specified policy. Attributes with a type exceeding maxtype will be
|
|
|
|
* ignored. See documenation of struct nla_policy for more details.
|
|
|
|
*
|
|
|
|
* Returns 0 on success or a negative error code.
|
|
|
|
*/
|
2010-11-17 00:52:32 +07:00
|
|
|
int nla_validate(const struct nlattr *head, int len, int maxtype,
|
2017-04-12 19:34:07 +07:00
|
|
|
const struct nla_policy *policy,
|
|
|
|
struct netlink_ext_ack *extack)
|
2005-11-10 08:25:51 +07:00
|
|
|
{
|
2010-11-17 00:52:32 +07:00
|
|
|
const struct nlattr *nla;
|
2017-04-12 19:34:07 +07:00
|
|
|
int rem;
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
nla_for_each_attr(nla, head, len, rem) {
|
2017-04-12 19:34:07 +07:00
|
|
|
int err = validate_nla(nla, maxtype, policy);
|
|
|
|
|
|
|
|
if (err < 0) {
|
|
|
|
if (extack)
|
|
|
|
extack->bad_attr = nla;
|
|
|
|
return err;
|
|
|
|
}
|
2005-11-10 08:25:51 +07:00
|
|
|
}
|
|
|
|
|
2017-04-12 19:34:07 +07:00
|
|
|
return 0;
|
2005-11-10 08:25:51 +07:00
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_validate);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2009-03-26 00:26:30 +07:00
|
|
|
/**
|
|
|
|
* 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;
|
|
|
|
|
2011-03-01 03:38:25 +07:00
|
|
|
for (i = 0; i < n; i++, p++) {
|
2009-03-26 00:26:30 +07:00
|
|
|
if (p->len)
|
|
|
|
len += nla_total_size(p->len);
|
|
|
|
else if (nla_attr_minlen[p->type])
|
|
|
|
len += nla_total_size(nla_attr_minlen[p->type]);
|
|
|
|
}
|
|
|
|
|
|
|
|
return len;
|
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_policy_len);
|
2009-03-26 00:26:30 +07:00
|
|
|
|
2005-11-10 08:25:51 +07:00
|
|
|
/**
|
|
|
|
* 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
|
2008-06-28 10:02:14 +07:00
|
|
|
* @policy: validation policy
|
2005-11-10 08:25:51 +07:00
|
|
|
*
|
|
|
|
* Parses a stream of attributes and stores a pointer to each attribute in
|
tree-wide: fix comment/printk typos
"gadget", "through", "command", "maintain", "maintain", "controller", "address",
"between", "initiali[zs]e", "instead", "function", "select", "already",
"equal", "access", "management", "hierarchy", "registration", "interest",
"relative", "memory", "offset", "already",
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-11-02 02:38:34 +07:00
|
|
|
* the tb array accessible via the attribute type. Attributes with a type
|
2005-11-10 08:25:51 +07:00
|
|
|
* exceeding maxtype will be silently ignored for backwards compatibility
|
|
|
|
* reasons. policy may be set to NULL if no validation is required.
|
|
|
|
*
|
|
|
|
* Returns 0 on success or a negative error code.
|
|
|
|
*/
|
2010-11-17 00:52:32 +07:00
|
|
|
int nla_parse(struct nlattr **tb, int maxtype, const struct nlattr *head,
|
2017-04-12 19:34:07 +07:00
|
|
|
int len, const struct nla_policy *policy,
|
|
|
|
struct netlink_ext_ack *extack)
|
2005-11-10 08:25:51 +07:00
|
|
|
{
|
2010-11-17 00:52:32 +07:00
|
|
|
const struct nlattr *nla;
|
2005-11-10 08:25:51 +07:00
|
|
|
int rem, err;
|
|
|
|
|
|
|
|
memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
|
|
|
|
|
|
|
|
nla_for_each_attr(nla, head, len, rem) {
|
2007-09-12 19:44:36 +07:00
|
|
|
u16 type = nla_type(nla);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
if (type > 0 && type <= maxtype) {
|
|
|
|
if (policy) {
|
|
|
|
err = validate_nla(nla, maxtype, policy);
|
2017-04-12 19:34:07 +07:00
|
|
|
if (err < 0) {
|
|
|
|
if (extack)
|
|
|
|
extack->bad_attr = nla;
|
2005-11-10 08:25:51 +07:00
|
|
|
goto errout;
|
2017-04-12 19:34:07 +07:00
|
|
|
}
|
2005-11-10 08:25:51 +07:00
|
|
|
}
|
|
|
|
|
2010-11-17 00:52:32 +07:00
|
|
|
tb[type] = (struct nlattr *)nla;
|
2005-11-10 08:25:51 +07:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (unlikely(rem > 0))
|
2014-06-02 23:25:02 +07:00
|
|
|
pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n",
|
|
|
|
rem, current->comm);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
err = 0;
|
|
|
|
errout:
|
|
|
|
return err;
|
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_parse);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
2010-11-17 00:52:32 +07:00
|
|
|
struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype)
|
2005-11-10 08:25:51 +07:00
|
|
|
{
|
2010-11-17 00:52:32 +07:00
|
|
|
const struct nlattr *nla;
|
2005-11-10 08:25:51 +07:00
|
|
|
int rem;
|
|
|
|
|
|
|
|
nla_for_each_attr(nla, head, len, rem)
|
2007-09-12 19:44:36 +07:00
|
|
|
if (nla_type(nla) == attrtype)
|
2010-11-17 00:52:32 +07:00
|
|
|
return (struct nlattr *)nla;
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_find);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* nla_strlcpy - Copy string attribute payload into a sized buffer
|
|
|
|
* @dst: where to copy the string to
|
2008-06-28 10:02:14 +07:00
|
|
|
* @nla: attribute to copy the string from
|
2005-11-10 08:25:51 +07:00
|
|
|
* @dstsize: size of destination buffer
|
|
|
|
*
|
|
|
|
* Copies at most dstsize - 1 bytes into the destination buffer.
|
|
|
|
* The result is always a valid NUL-terminated string. Unlike
|
|
|
|
* strlcpy the destination buffer is always padded out.
|
|
|
|
*
|
|
|
|
* Returns the length of the source buffer.
|
|
|
|
*/
|
|
|
|
size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
|
|
|
|
{
|
|
|
|
size_t srclen = nla_len(nla);
|
|
|
|
char *src = nla_data(nla);
|
|
|
|
|
|
|
|
if (srclen > 0 && src[srclen - 1] == '\0')
|
|
|
|
srclen--;
|
|
|
|
|
|
|
|
if (dstsize > 0) {
|
|
|
|
size_t len = (srclen >= dstsize) ? dstsize - 1 : srclen;
|
|
|
|
|
|
|
|
memset(dst, 0, dstsize);
|
|
|
|
memcpy(dst, src, len);
|
|
|
|
}
|
|
|
|
|
|
|
|
return srclen;
|
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_strlcpy);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2017-07-27 21:56:40 +07:00
|
|
|
/**
|
|
|
|
* 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);
|
|
|
|
|
2005-11-10 08:25:51 +07:00
|
|
|
/**
|
|
|
|
* 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.
|
|
|
|
*/
|
2008-10-29 01:59:11 +07:00
|
|
|
int nla_memcpy(void *dest, const struct nlattr *src, int count)
|
2005-11-10 08:25:51 +07:00
|
|
|
{
|
|
|
|
int minlen = min_t(int, count, nla_len(src));
|
|
|
|
|
|
|
|
memcpy(dest, nla_data(src), minlen);
|
2015-03-29 21:05:28 +07:00
|
|
|
if (count > minlen)
|
|
|
|
memset(dest + minlen, 0, count - minlen);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
return minlen;
|
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_memcpy);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* 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;
|
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_memcmp);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* 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)
|
|
|
|
{
|
2014-04-02 00:38:44 +07:00
|
|
|
int len = strlen(str);
|
|
|
|
char *buf = nla_data(nla);
|
|
|
|
int attrlen = nla_len(nla);
|
|
|
|
int d;
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2014-04-02 00:38:44 +07:00
|
|
|
if (attrlen > 0 && buf[attrlen - 1] == '\0')
|
|
|
|
attrlen--;
|
|
|
|
|
|
|
|
d = attrlen - len;
|
2005-11-10 08:25:51 +07:00
|
|
|
if (d == 0)
|
|
|
|
d = memcmp(nla_data(nla), str, len);
|
|
|
|
|
|
|
|
return d;
|
|
|
|
}
|
2014-06-05 06:11:57 +07:00
|
|
|
EXPORT_SYMBOL(nla_strcmp);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2009-03-11 22:18:32 +07:00
|
|
|
#ifdef CONFIG_NET
|
2005-11-10 08:25:51 +07:00
|
|
|
/**
|
|
|
|
* __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;
|
|
|
|
|
networking: make skb_put & friends return void pointers
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.
Make these functions (skb_put, __skb_put and pskb_put) return void *
and remove all the casts across the tree, adding a (u8 *) cast only
where the unsigned char pointer was used directly, all done with the
following spatch:
@@
expression SKB, LEN;
typedef u8;
identifier fn = { skb_put, __skb_put };
@@
- *(fn(SKB, LEN))
+ *(u8 *)fn(SKB, LEN)
@@
expression E, SKB, LEN;
identifier fn = { skb_put, __skb_put };
type T;
@@
- E = ((T *)(fn(SKB, LEN)))
+ E = fn(SKB, LEN)
which actually doesn't cover pskb_put since there are only three
users overall.
A handful of stragglers were converted manually, notably a macro in
drivers/isdn/i4l/isdn_bsdcomp.c and, oddly enough, one of the many
instances in net/bluetooth/hci_sock.c. In the former file, I also
had to fix one whitespace problem spatch introduced.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 19:29:21 +07:00
|
|
|
nla = skb_put(skb, nla_total_size(attrlen));
|
2005-11-10 08:25:51 +07:00
|
|
|
nla->nla_type = attrtype;
|
|
|
|
nla->nla_len = nla_attr_size(attrlen);
|
|
|
|
|
|
|
|
memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen));
|
|
|
|
|
|
|
|
return nla;
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(__nla_reserve);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2016-04-21 23:58:24 +07:00
|
|
|
/**
|
|
|
|
* __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
|
2016-04-22 22:31:16 +07:00
|
|
|
* @padattr: attribute type for the padding
|
2016-04-21 23:58:24 +07:00
|
|
|
*
|
|
|
|
* 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
|
2016-04-22 22:31:16 +07:00
|
|
|
* attribute will have a 64-bit aligned nla_data() area.
|
2016-04-21 23:58:24 +07:00
|
|
|
*
|
|
|
|
* 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)
|
|
|
|
{
|
|
|
|
if (nla_need_padding_for_64bit(skb))
|
|
|
|
nla_align_64bit(skb, padattr);
|
|
|
|
|
|
|
|
return __nla_reserve(skb, attrtype, attrlen);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(__nla_reserve_64bit);
|
|
|
|
|
2006-08-05 13:03:05 +07:00
|
|
|
/**
|
|
|
|
* __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)
|
|
|
|
{
|
2017-06-18 21:52:04 +07:00
|
|
|
return skb_put_zero(skb, NLA_ALIGN(attrlen));
|
2006-08-05 13:03:05 +07:00
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(__nla_reserve_nohdr);
|
2006-08-05 13:03:05 +07:00
|
|
|
|
2005-11-10 08:25:51 +07:00
|
|
|
/**
|
|
|
|
* 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);
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(nla_reserve);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2016-04-21 23:58:24 +07:00
|
|
|
/**
|
|
|
|
* 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
|
2016-04-22 22:31:16 +07:00
|
|
|
* @padattr: attribute type for the padding
|
2016-04-21 23:58:24 +07:00
|
|
|
*
|
|
|
|
* 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
|
2016-04-22 22:31:16 +07:00
|
|
|
* attribute will have a 64-bit aligned nla_data() area.
|
2016-04-21 23:58:24 +07:00
|
|
|
*
|
|
|
|
* 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);
|
|
|
|
|
2006-08-05 13:03:05 +07:00
|
|
|
/**
|
2008-06-28 10:02:14 +07:00
|
|
|
* nla_reserve_nohdr - reserve room for attribute without header
|
2006-08-05 13:03:05 +07:00
|
|
|
* @skb: socket buffer to reserve room on
|
2008-06-28 10:02:14 +07:00
|
|
|
* @attrlen: length of attribute payload
|
2006-08-05 13:03:05 +07:00
|
|
|
*
|
|
|
|
* 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);
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(nla_reserve_nohdr);
|
2006-08-05 13:03:05 +07:00
|
|
|
|
2005-11-10 08:25:51 +07:00
|
|
|
/**
|
|
|
|
* __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);
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(__nla_put);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2016-04-21 23:58:24 +07:00
|
|
|
/**
|
|
|
|
* __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
|
2016-04-22 22:31:16 +07:00
|
|
|
* @padattr: attribute type for the padding
|
2016-04-21 23:58:24 +07:00
|
|
|
*
|
|
|
|
* 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);
|
|
|
|
|
2006-08-05 13:03:05 +07:00
|
|
|
/**
|
|
|
|
* __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);
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(__nla_put_nohdr);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
*
|
2008-06-04 06:36:54 +07:00
|
|
|
* Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
|
2005-11-10 08:25:51 +07:00
|
|
|
* 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)))
|
2008-06-04 06:36:54 +07:00
|
|
|
return -EMSGSIZE;
|
2005-11-10 08:25:51 +07:00
|
|
|
|
|
|
|
__nla_put(skb, attrtype, attrlen, data);
|
|
|
|
return 0;
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(nla_put);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2016-04-21 23:58:24 +07:00
|
|
|
/**
|
|
|
|
* 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
|
2016-04-22 22:31:16 +07:00
|
|
|
* @padattr: attribute type for the padding
|
2016-04-21 23:58:24 +07:00
|
|
|
*
|
|
|
|
* 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);
|
|
|
|
|
2006-08-05 13:03:05 +07:00
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
*
|
2008-06-04 06:36:54 +07:00
|
|
|
* Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
|
2006-08-05 13:03:05 +07:00
|
|
|
* the attribute payload.
|
|
|
|
*/
|
|
|
|
int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
|
|
|
|
{
|
|
|
|
if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
|
2008-06-04 06:36:54 +07:00
|
|
|
return -EMSGSIZE;
|
2006-08-05 13:03:05 +07:00
|
|
|
|
|
|
|
__nla_put_nohdr(skb, attrlen, data);
|
|
|
|
return 0;
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(nla_put_nohdr);
|
2005-11-10 08:25:51 +07:00
|
|
|
|
2008-01-23 13:10:59 +07:00
|
|
|
/**
|
|
|
|
* 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
|
|
|
|
*
|
2008-06-04 06:36:54 +07:00
|
|
|
* Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
|
2008-01-23 13:10:59 +07:00
|
|
|
* the attribute payload.
|
|
|
|
*/
|
|
|
|
int nla_append(struct sk_buff *skb, int attrlen, const void *data)
|
|
|
|
{
|
|
|
|
if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
|
2008-06-04 06:36:54 +07:00
|
|
|
return -EMSGSIZE;
|
2008-01-23 13:10:59 +07:00
|
|
|
|
networking: introduce and use skb_put_data()
A common pattern with skb_put() is to just want to memcpy()
some data into the new space, introduce skb_put_data() for
this.
An spatch similar to the one for skb_put_zero() converts many
of the places using it:
@@
identifier p, p2;
expression len, skb, data;
type t, t2;
@@
(
-p = skb_put(skb, len);
+p = skb_put_data(skb, data, len);
|
-p = (t)skb_put(skb, len);
+p = skb_put_data(skb, data, len);
)
(
p2 = (t2)p;
-memcpy(p2, data, len);
|
-memcpy(p, data, len);
)
@@
type t, t2;
identifier p, p2;
expression skb, data;
@@
t *p;
...
(
-p = skb_put(skb, sizeof(t));
+p = skb_put_data(skb, data, sizeof(t));
|
-p = (t *)skb_put(skb, sizeof(t));
+p = skb_put_data(skb, data, sizeof(t));
)
(
p2 = (t2)p;
-memcpy(p2, data, sizeof(*p));
|
-memcpy(p, data, sizeof(*p));
)
@@
expression skb, len, data;
@@
-memcpy(skb_put(skb, len), data, len);
+skb_put_data(skb, data, len);
(again, manually post-processed to retain some comments)
Reviewed-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 19:29:20 +07:00
|
|
|
skb_put_data(skb, data, attrlen);
|
2008-01-23 13:10:59 +07:00
|
|
|
return 0;
|
|
|
|
}
|
2009-03-11 22:18:32 +07:00
|
|
|
EXPORT_SYMBOL(nla_append);
|
|
|
|
#endif
|