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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
1 changed files with 152 additions and 47 deletions
199
lib/vsprintf.c
199
lib/vsprintf.c
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@ -25,6 +25,7 @@
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#include <linux/kallsyms.h>
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#include <linux/uaccess.h>
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#include <linux/ioport.h>
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#include <net/addrconf.h>
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#include <asm/page.h> /* for PAGE_SIZE */
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#include <asm/div64.h>
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@ -630,60 +631,156 @@ static char *resource_string(char *buf, char *end, struct resource *res,
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}
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static char *mac_address_string(char *buf, char *end, u8 *addr,
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struct printf_spec spec)
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struct printf_spec spec, const char *fmt)
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{
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char mac_addr[6 * 3]; /* (6 * 2 hex digits), 5 colons and trailing zero */
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char mac_addr[sizeof("xx:xx:xx:xx:xx:xx")];
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char *p = mac_addr;
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int i;
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for (i = 0; i < 6; i++) {
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p = pack_hex_byte(p, addr[i]);
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if (!(spec.flags & SPECIAL) && i != 5)
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if (fmt[0] == 'M' && i != 5)
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*p++ = ':';
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}
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*p = '\0';
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spec.flags &= ~SPECIAL;
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return string(buf, end, mac_addr, spec);
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}
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static char *ip6_addr_string(char *buf, char *end, u8 *addr,
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struct printf_spec spec)
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static char *ip4_string(char *p, const u8 *addr, bool leading_zeros)
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{
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char ip6_addr[8 * 5]; /* (8 * 4 hex digits), 7 colons and trailing zero */
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char *p = ip6_addr;
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int i;
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for (i = 0; i < 4; i++) {
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char temp[3]; /* hold each IP quad in reverse order */
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int digits = put_dec_trunc(temp, addr[i]) - temp;
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if (leading_zeros) {
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if (digits < 3)
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*p++ = '0';
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if (digits < 2)
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*p++ = '0';
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}
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/* reverse the digits in the quad */
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while (digits--)
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*p++ = temp[digits];
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if (i < 3)
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*p++ = '.';
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}
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*p = '\0';
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return p;
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}
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static char *ip6_compressed_string(char *p, const struct in6_addr *addr)
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{
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int i;
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int j;
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int range;
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unsigned char zerolength[8];
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int longest = 1;
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int colonpos = -1;
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u16 word;
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u8 hi;
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u8 lo;
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bool needcolon = false;
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bool useIPv4 = ipv6_addr_v4mapped(addr) || ipv6_addr_is_isatap(addr);
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memset(zerolength, 0, sizeof(zerolength));
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if (useIPv4)
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range = 6;
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else
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range = 8;
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/* find position of longest 0 run */
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for (i = 0; i < range; i++) {
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for (j = i; j < range; j++) {
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if (addr->s6_addr16[j] != 0)
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break;
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zerolength[i]++;
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}
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}
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for (i = 0; i < range; i++) {
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if (zerolength[i] > longest) {
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longest = zerolength[i];
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colonpos = i;
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}
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}
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/* emit address */
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for (i = 0; i < range; i++) {
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if (i == colonpos) {
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if (needcolon || i == 0)
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*p++ = ':';
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*p++ = ':';
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needcolon = false;
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i += longest - 1;
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continue;
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}
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if (needcolon) {
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*p++ = ':';
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needcolon = false;
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}
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/* hex u16 without leading 0s */
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word = ntohs(addr->s6_addr16[i]);
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hi = word >> 8;
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lo = word & 0xff;
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if (hi) {
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if (hi > 0x0f)
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p = pack_hex_byte(p, hi);
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else
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*p++ = hex_asc_lo(hi);
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}
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if (hi || lo > 0x0f)
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p = pack_hex_byte(p, lo);
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else
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*p++ = hex_asc_lo(lo);
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needcolon = true;
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}
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if (useIPv4) {
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if (needcolon)
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*p++ = ':';
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p = ip4_string(p, &addr->s6_addr[12], false);
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}
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*p = '\0';
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return p;
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}
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static char *ip6_string(char *p, const struct in6_addr *addr, const char *fmt)
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{
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int i;
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for (i = 0; i < 8; i++) {
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p = pack_hex_byte(p, addr[2 * i]);
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p = pack_hex_byte(p, addr[2 * i + 1]);
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if (!(spec.flags & SPECIAL) && i != 7)
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p = pack_hex_byte(p, addr->s6_addr[2 * i]);
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p = pack_hex_byte(p, addr->s6_addr[2 * i + 1]);
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if (fmt[0] == 'I' && i != 7)
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*p++ = ':';
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}
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*p = '\0';
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spec.flags &= ~SPECIAL;
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return p;
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}
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static char *ip6_addr_string(char *buf, char *end, const u8 *addr,
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struct printf_spec spec, const char *fmt)
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{
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char ip6_addr[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255")];
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if (fmt[0] == 'I' && fmt[2] == 'c')
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ip6_compressed_string(ip6_addr, (const struct in6_addr *)addr);
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else
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ip6_string(ip6_addr, (const struct in6_addr *)addr, fmt);
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return string(buf, end, ip6_addr, spec);
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}
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static char *ip4_addr_string(char *buf, char *end, u8 *addr,
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struct printf_spec spec)
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static char *ip4_addr_string(char *buf, char *end, const u8 *addr,
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struct printf_spec spec, const char *fmt)
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{
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char ip4_addr[4 * 4]; /* (4 * 3 decimal digits), 3 dots and trailing zero */
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char temp[3]; /* hold each IP quad in reverse order */
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char *p = ip4_addr;
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int i, digits;
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char ip4_addr[sizeof("255.255.255.255")];
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for (i = 0; i < 4; i++) {
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digits = put_dec_trunc(temp, addr[i]) - temp;
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/* reverse the digits in the quad */
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while (digits--)
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*p++ = temp[digits];
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if (i != 3)
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*p++ = '.';
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}
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*p = '\0';
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spec.flags &= ~SPECIAL;
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ip4_string(ip4_addr, addr, fmt[0] == 'i');
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return string(buf, end, ip4_addr, spec);
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}
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@ -702,11 +799,15 @@ static char *ip4_addr_string(char *buf, char *end, u8 *addr,
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* addresses (not the name nor the flags)
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* - 'M' For a 6-byte MAC address, it prints the address in the
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* usual colon-separated hex notation
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* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way (dot-separated
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* decimal for v4 and colon separated network-order 16 bit hex for v6)
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* - 'i' [46] for 'raw' IPv4/IPv6 addresses, IPv6 omits the colons, IPv4 is
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* currently the same
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*
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* - 'm' For a 6-byte MAC address, it prints the hex address without colons
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* - 'I' [46] for IPv4/IPv6 addresses printed in the usual way
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* IPv4 uses dot-separated decimal without leading 0's (1.2.3.4)
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* IPv6 uses colon separated network-order 16 bit hex with leading 0's
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* - 'i' [46] for 'raw' IPv4/IPv6 addresses
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* IPv6 omits the colons (01020304...0f)
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* IPv4 uses dot-separated decimal with leading 0's (010.123.045.006)
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* - 'I6c' for IPv6 addresses printed as specified by
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* http://www.ietf.org/id/draft-kawamura-ipv6-text-representation-03.txt
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* Note: The difference between 'S' and 'F' is that on ia64 and ppc64
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* function pointers are really function descriptors, which contain a
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* pointer to the real address.
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@ -726,20 +827,24 @@ static char *pointer(const char *fmt, char *buf, char *end, void *ptr,
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return symbol_string(buf, end, ptr, spec, *fmt);
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case 'R':
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return resource_string(buf, end, ptr, spec);
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case 'm':
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spec.flags |= SPECIAL;
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/* Fallthrough */
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case 'M':
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return mac_address_string(buf, end, ptr, spec);
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case 'i':
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spec.flags |= SPECIAL;
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/* Fallthrough */
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case 'I':
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if (fmt[1] == '6')
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return ip6_addr_string(buf, end, ptr, spec);
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if (fmt[1] == '4')
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return ip4_addr_string(buf, end, ptr, spec);
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spec.flags &= ~SPECIAL;
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case 'M': /* Colon separated: 00:01:02:03:04:05 */
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case 'm': /* Contiguous: 000102030405 */
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return mac_address_string(buf, end, ptr, spec, fmt);
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case 'I': /* Formatted IP supported
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* 4: 1.2.3.4
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* 6: 0001:0203:...:0708
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* 6c: 1::708 or 1::1.2.3.4
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*/
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case 'i': /* Contiguous:
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* 4: 001.002.003.004
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* 6: 000102...0f
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*/
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switch (fmt[1]) {
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case '6':
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return ip6_addr_string(buf, end, ptr, spec, fmt);
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case '4':
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return ip4_addr_string(buf, end, ptr, spec, fmt);
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}
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break;
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}
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spec.flags |= SMALL;
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