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/* SPDX-License-Identifier: GPL-2.0 */
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <linux/mpls.h>
#include "utils.h"
static const char *mpls_ntop1(const struct mpls_label *addr, char *buf, size_t buflen)
{
size_t destlen = buflen;
char *dest = buf;
int count = 0;
while (1) {
uint32_t entry = ntohl(addr[count++].entry);
uint32_t label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
int len = snprintf(dest, destlen, "%u", label);
if (len >= destlen)
break;
/* Is this the end? */
if (entry & MPLS_LS_S_MASK)
return buf;
dest += len;
destlen -= len;
if (destlen) {
*dest = '/';
dest++;
destlen--;
}
}
errno = -E2BIG;
return NULL;
}
const char *mpls_ntop(int af, const void *addr, char *buf, size_t buflen)
{
switch (af) {
case AF_MPLS:
errno = 0;
return mpls_ntop1((struct mpls_label *)addr, buf, buflen);
default:
errno = EAFNOSUPPORT;
}
return NULL;
}
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