1 #include <errno.h> 2 #include <string.h> 3 #include <sys/types.h> 4 #include <netinet/in.h> 5 #include <linux/mpls.h> 6 7 #include "utils.h" 8 9 static const char *mpls_ntop1(const struct mpls_label *addr, char *buf, size_t buflen) 10 { 11 size_t destlen = buflen; 12 char *dest = buf; 13 int count; 14 15 for (count = 0; count < MPLS_MAX_LABELS; count++) { 16 uint32_t entry = ntohl(addr[count].entry); 17 uint32_t label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT; 18 int len = snprintf(dest, destlen, "%u", label); 19 20 /* Is this the end? */ 21 if (entry & MPLS_LS_S_MASK) 22 return buf; 23 24 25 dest += len; 26 destlen -= len; 27 if (destlen) { 28 *dest = '/'; 29 dest++; 30 destlen--; 31 } 32 } 33 errno = -E2BIG; 34 return NULL; 35 } 36 37 const char *mpls_ntop(int af, const void *addr, char *buf, size_t buflen) 38 { 39 switch(af) { 40 case AF_MPLS: 41 errno = 0; 42 return mpls_ntop1((struct mpls_label *)addr, buf, buflen); 43 default: 44 errno = EAFNOSUPPORT; 45 } 46 47 return NULL; 48 } 49
