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