mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 22:21:40 +00:00
lib/vsprintf.c: Add "%pI6c" - print pointer as compressed ipv6 address
Signed-off-by: Joe Perches <joe@perches.com> Tested-by: Jens Rosenboom <jens@mcbone.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Joe Perches
David S. Miller
parent
9a7030b76a
commit
8a27f7c90f
199
lib/vsprintf.c
199
lib/vsprintf.c
@ -25,6 +25,7 @@
|
||||
#include <linux/kallsyms.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/ioport.h>
|
||||
#include <net/addrconf.h>
|
||||
|
||||
#include <asm/page.h> /* for PAGE_SIZE */
|
||||
#include <asm/div64.h>
|
||||
@ -630,60 +631,156 @@ static char *resource_string(char *buf, char *end, struct resource *res,
|
||||
}
|
||||
|
||||
static char *mac_address_string(char *buf, char *end, u8 *addr,
|
||||
struct printf_spec spec)
|
||||
struct printf_spec spec, const char *fmt)
|
||||
{
|
||||
char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
|
||||
char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
|
||||
char *p = mac_addr;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 6; i++) {
|
||||
p = pack_hex_byte(p, addr[i]);
|
||||
if (!(spec.flags & SPECIAL) && i != 5)
|
||||
if (fmt[0] == 'M' && i != 5)
|
||||
*p++ = ':';
|
||||
}
|
||||
*p = '\0';
|
||||
spec.flags &= ~SPECIAL;
|
||||
|
||||
return string(buf, end, mac_addr, spec);
|
||||
}
|
||||
|
||||
static char *ip6_addr_string(char *buf, char *end, u8 *addr,
|
||||
struct printf_spec spec)
|
||||
static char *ip4_string(char *p, const u8 *addr, bool leading_zeros)
|
||||
{
|
||||
char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
|
||||
char *p = ip6_addr;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
char temp[3]; /* hold each IP quad in reverse order */
|
||||
int digits = put_dec_trunc(temp, addr[i]) - temp;
|
||||
if (leading_zeros) {
|
||||
if (digits < 3)
|
||||
*p++ = '0';
|
||||
if (digits < 2)
|
||||
*p++ = '0';
|
||||
}
|
||||
/* reverse the digits in the quad */
|
||||
while (digits--)
|
||||
*p++ = temp[digits];
|
||||
if (i < 3)
|
||||
*p++ = '.';
|
||||
}
|
||||
|
||||
*p = '\0';
|
||||
return p;
|
||||
}
|
||||
|
||||
static char *ip6_compressed_string(char *p, const struct in6_addr *addr)
|
||||
{
|
||||
int i;
|
||||
int j;
|
||||
int range;
|
||||
unsigned char zerolength[8];
|
||||
int longest = 1;
|
||||
int colonpos = -1;
|
||||
u16 word;
|
||||
u8 hi;
|
||||
u8 lo;
|
||||
bool needcolon = false;
|
||||
bool useIPv4 = ipv6_addr_v4mapped(addr) || ipv6_addr_is_isatap(addr);
|
||||
|
||||
memset(zerolength, 0, sizeof(zerolength));
|
||||
|
||||
if (useIPv4)
|
||||
range = 6;
|
||||
else
|
||||
range = 8;
|
||||
|
||||
/* find position of longest 0 run */
|
||||
for (i = 0; i < range; i++) {
|
||||
for (j = i; j < range; j++) {
|
||||
if (addr->s6_addr16[j] != 0)
|
||||
break;
|
||||
zerolength[i]++;
|
||||
}
|
||||
}
|
||||
for (i = 0; i < range; i++) {
|
||||
if (zerolength[i] > longest) {
|
||||
longest = zerolength[i];
|
||||
colonpos = i;
|
||||
}
|
||||
}
|
||||
|
||||
/* emit address */
|
||||
for (i = 0; i < range; i++) {
|
||||
if (i == colonpos) {
|
||||
if (needcolon || i == 0)
|
||||
*p++ = ':';
|
||||
*p++ = ':';
|
||||
needcolon = false;
|
||||
i += longest - 1;
|
||||
continue;
|
||||
}
|
||||
if (needcolon) {
|
||||
*p++ = ':';
|
||||
needcolon = false;
|
||||
}
|
||||
/* hex u16 without leading 0s */
|
||||
word = ntohs(addr->s6_addr16[i]);
|
||||
hi = word >> 8;
|
||||
lo = word & 0xff;
|
||||
if (hi) {
|
||||
if (hi > 0x0f)
|
||||
p = pack_hex_byte(p, hi);
|
||||
else
|
||||
*p++ = hex_asc_lo(hi);
|
||||
}
|
||||
if (hi || lo > 0x0f)
|
||||
p = pack_hex_byte(p, lo);
|
||||
else
|
||||
*p++ = hex_asc_lo(lo);
|
||||
needcolon = true;
|
||||
}
|
||||
|
||||
if (useIPv4) {
|
||||
if (needcolon)
|
||||
*p++ = ':';
|
||||
p = ip4_string(p, &addr->s6_addr[12], false);
|
||||
}
|
||||
|
||||
*p = '\0';
|
||||
return p;
|
||||
}
|
||||
|
||||
static char *ip6_string(char *p, const struct in6_addr *addr, const char *fmt)
|
||||
{
|
||||
int i;
|
||||
for (i = 0; i < 8; i++) {
|
||||
p = pack_hex_byte(p, addr[2 * i]);
|
||||
p = pack_hex_byte(p, addr[2 * i + 1]);
|
||||
if (!(spec.flags & SPECIAL) && i != 7)
|
||||
p = pack_hex_byte(p, addr->s6_addr[2 * i]);
|
||||
p = pack_hex_byte(p, addr->s6_addr[2 * i + 1]);
|
||||
if (fmt[0] == 'I' && i != 7)
|
||||
*p++ = ':';
|
||||
}
|
||||
|
||||
*p = '\0';
|
||||
spec.flags &= ~SPECIAL;
|
||||
return p;
|
||||
}
|
||||
|
||||
static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
|
||||
struct printf_spec spec, const char *fmt)
|
||||
{
|
||||
char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
|
||||
|
||||
if (fmt[0] == 'I' && fmt[2] == 'c')
|
||||
ip6_compressed_string(ip6_addr, (const struct in6_addr *)addr);
|
||||
else
|
||||
ip6_string(ip6_addr, (const struct in6_addr *)addr, fmt);
|
||||
|
||||
return string(buf, end, ip6_addr, spec);
|
||||
}
|
||||
|
||||
static char *ip4_addr_string(char *buf, char *end, u8 *addr,
|
||||
struct printf_spec spec)
|
||||
static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
|
||||
struct printf_spec spec, const char *fmt)
|
||||
{
|
||||
char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
|
||||
char temp[3]; /* hold each IP quad in reverse order */
|
||||
char *p = ip4_addr;
|
||||
int i, digits;
|
||||
char ip4_addr[sizeof("255.255.255.255")];
|
||||
|
||||
for (i = 0; i < 4; i++) {
|
||||
digits = put_dec_trunc(temp, addr[i]) - temp;
|
||||
/* reverse the digits in the quad */
|
||||
while (digits--)
|
||||
*p++ = temp[digits];
|
||||
if (i != 3)
|
||||
*p++ = '.';
|
||||
}
|
||||
*p = '\0';
|
||||
spec.flags &= ~SPECIAL;
|
||||
ip4_string(ip4_addr, addr, fmt[0] == 'i');
|
||||
|
||||
return string(buf, end, ip4_addr, spec);
|
||||
}
|
||||
@ -702,11 +799,15 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr,
|
||||
* addresses (not the name nor the flags)
|
||||
* - 'M' For a 6-byte MAC address, it prints the address in the
|
||||
* usual colon-separated hex notation
|
||||
* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
|
||||
* decimal for v4 and colon separated network-order 16 bit hex for v6)
|
||||
* - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
|
||||
* currently the same
|
||||
*
|
||||
* - 'm' For a 6-byte MAC address, it prints the hex address without colons
|
||||
* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
|
||||
* IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
|
||||
* IPv6 uses colon separated network-order 16 bit hex with leading 0's
|
||||
* - 'i' [46] for 'raw' IPv4/IPv6 addresses
|
||||
* IPv6 omits the colons (01020304...0f)
|
||||
* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
|
||||
* - 'I6c' for IPv6 addresses printed as specified by
|
||||
* http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
|
||||
* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
|
||||
* function pointers are really function descriptors, which contain a
|
||||
* pointer to the real address.
|
||||
@ -726,20 +827,24 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
|
||||
return symbol_string(buf, end, ptr, spec, *fmt);
|
||||
case 'R':
|
||||
return resource_string(buf, end, ptr, spec);
|
||||
case 'm':
|
||||
spec.flags |= SPECIAL;
|
||||
/* Fallthrough */
|
||||
case 'M':
|
||||
return mac_address_string(buf, end, ptr, spec);
|
||||
case 'i':
|
||||
spec.flags |= SPECIAL;
|
||||
/* Fallthrough */
|
||||
case 'I':
|
||||
if (fmt[1] == '6')
|
||||
return ip6_addr_string(buf, end, ptr, spec);
|
||||
if (fmt[1] == '4')
|
||||
return ip4_addr_string(buf, end, ptr, spec);
|
||||
spec.flags &= ~SPECIAL;
|
||||
case 'M': /* Colon separated: 00:01:02:03:04:05 */
|
||||
case 'm': /* Contiguous: 000102030405 */
|
||||
return mac_address_string(buf, end, ptr, spec, fmt);
|
||||
case 'I': /* Formatted IP supported
|
||||
* 4: 1.2.3.4
|
||||
* 6: 0001:0203:...:0708
|
||||
* 6c: 1::708 or 1::1.2.3.4
|
||||
*/
|
||||
case 'i': /* Contiguous:
|
||||
* 4: 001.002.003.004
|
||||
* 6: 000102...0f
|
||||
*/
|
||||
switch (fmt[1]) {
|
||||
case '6':
|
||||
return ip6_addr_string(buf, end, ptr, spec, fmt);
|
||||
case '4':
|
||||
return ip4_addr_string(buf, end, ptr, spec, fmt);
|
||||
}
|
||||
break;
|
||||
}
|
||||
spec.flags |= SMALL;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user