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Better prints of ::FFFF: prefixed IPv4-mapped addresses

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IPv4-mapped Address [1] are now printed accoriding to the text representation
mixed IPv4 and IPv6 networks as specified in [2]

[1] https://tools.ietf.org/html/rfc6890#page-14
[2] https://tools.ietf.org/html/rfc3513#page-5
This commit is contained in:
Valentin Sawadski 2015-09-18 14:53:57 +02:00
parent 552408b241
commit cad1c37fb3
2 changed files with 44 additions and 13 deletions
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14
core/net/ip/ip64-addr.h
View file

@ -34,6 +34,20 @@
#include "net/ip/uip.h"
/**
* \brief Is IPv4-mapped Address
*
* See https://tools.ietf.org/html/rfc6890#page-14
*/
#define ip64_addr_is_ipv4_mapped_addr(a) \
((((a)->u16[0]) == 0) && \
(((a)->u16[1]) == 0) && \
(((a)->u16[2]) == 0) && \
(((a)->u16[3]) == 0) && \
(((a)->u16[4]) == 0) && \
(((a)->u16[5]) == 0xFFFF))
void ip64_addr_copy4(uip_ip4addr_t *dest, const uip_ip4addr_t *src);
void ip64_addr_copy6(uip_ip6addr_t *dest, const uip_ip6addr_t *src);

17
core/net/ip/uip-debug.c
View file

@ -38,6 +38,7 @@
*/
#include "net/ip/uip-debug.h"
#include "net/ip/ip64-addr.h"
/*---------------------------------------------------------------------------*/
void
@ -53,6 +54,21 @@ uip_debug_ipaddr_print(const uip_ipaddr_t *addr)
return;
}
#if NETSTACK_CONF_WITH_IPV6
if(ip64_addr_is_ipv4_mapped_addr(addr)) {
/* Printing IPv4-mapped addresses is done according to RFC 3513 [1]
*
* An alternative form that is sometimes more
* convenient when dealing with a mixed environment
* of IPv4 and IPv6 nodes is x:x:x:x:x:x:d.d.d.d,
* where the 'x's are the hexadecimal values of the
* six high-order 16-bit pieces of the address, and
* the 'd's are the decimal values of the four
* low-order 8-bit pieces of the address (standard
* IPv4 representation).
*
* [1] https://tools.ietf.org/html/rfc3513#page-5 */
PRINTA("::FFFF:%u.%u.%u.%u", addr->u8[12], addr->u8[13], addr->u8[14], addr->u8[15]);
} else {
for(i = 0, f = 0; i < sizeof(uip_ipaddr_t); i += 2) {
a = (addr->u8[i] << 8) + addr->u8[i + 1];
if(a == 0 && f >= 0) {
@ -68,6 +84,7 @@ uip_debug_ipaddr_print(const uip_ipaddr_t *addr)
PRINTA("%x", a);
}
}
}
#else /* NETSTACK_CONF_WITH_IPV6 */
PRINTA("%u.%u.%u.%u", addr->u8[0], addr->u8[1], addr->u8[2], addr->u8[3]);
#endif /* NETSTACK_CONF_WITH_IPV6 */