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LinuxKPI: add kstrtou32_from_user() and mac_pton()

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While here:
- fix an argument of kstrtouint_from_user() to correct signedness.
- make kstrtou32() call kstrtouint() to avoid duplication (keep inline
  function)

Add kstrtou32_from_user() based on other examples in the file
making it a copy of the now fixed kstrtouint_from_user().

Also add a rudimentarily hacked up version of mac_pton() which is
leanient accepting non-well-formed input but so far only with ':'
separators.  It does not seem to obviously belong to any networking
header file so add it here.

Both new functions are needed for debugfs support for iwlwifi hence
coming together in one commit.

Sponsored by:	The FreeBSD Foundation
Commented on by:	emaste
Differential Revision: https://reviews.freebsd.org/D37088

(cherry picked from commit f82cf28b31)
This commit is contained in:
Bjoern A. Zeeb 2022-10-22 18:02:58 +00:00
parent 4c7aee8a70
commit b1479a5409
1 changed files with 52 additions and 13 deletions
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65
sys/compat/linuxkpi/common/include/linux/kernel.h
View file

@ -437,19 +437,8 @@ kstrtou16(const char *cp, unsigned int base, u16 *res)
static inline int
kstrtou32(const char *cp, unsigned int base, u32 *res)
{
char *end;
unsigned long temp;
*res = temp = strtoul(cp, &end, base);
/* skip newline character, if any */
if (*end == '\n')
end++;
if (*cp == 0 || *end != 0)
return (-EINVAL);
if (temp != (u32)temp)
return (-ERANGE);
return (0);
return (kstrtouint(cp, base, res));
}
static inline int
@ -530,7 +519,7 @@ kstrtoint_from_user(const char __user *s, size_t count, unsigned int base,
static inline int
kstrtouint_from_user(const char __user *s, size_t count, unsigned int base,
int *p)
unsigned int *p)
{
char buf[36] = {};
@ -543,6 +532,14 @@ kstrtouint_from_user(const char __user *s, size_t count, unsigned int base,
return (kstrtouint(buf, base, p));
}
static inline int
kstrtou32_from_user(const char __user *s, size_t count, unsigned int base,
unsigned int *p)
{
return (kstrtouint_from_user(s, count, base, p));
}
static inline int
kstrtou8_from_user(const char __user *s, size_t count, unsigned int base,
u8 *p)
@ -716,6 +713,48 @@ hex2bin(uint8_t *bindst, const char *hexsrc, size_t binlen)
return (0);
}
static inline bool
mac_pton(const char *macin, uint8_t *macout)
{
const char *s, *d;
uint8_t mac[6], hx, lx;;
int i;
if (strlen(macin) < (3 * 6 - 1))
return (false);
i = 0;
s = macin;
do {
/* Should we also support '-'-delimiters? */
d = strchrnul(s, ':');
hx = lx = 0;
while (s < d) {
/* Fail on abc:123:xxx:... */
if ((d - s) > 2)
return (false);
/* We do support non-well-formed strings: 3:45:6:... */
if ((d - s) > 1) {
hx = _h2b(*s);
if (hx < 0)
return (false);
s++;
}
lx = _h2b(*s);
if (lx < 0)
return (false);
s++;
}
mac[i] = (hx << 4) | lx;
i++;
if (i >= 6)
return (false);
} while (d != NULL && *d != '\0');
memcpy(macout, mac, 6);
return (true);
}
#define DECLARE_FLEX_ARRAY(_t, _n) \
struct { struct { } __dummy_ ## _n; _t _n[0]; }