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 = 0; 14 15 while (1) { 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 if (len >= destlen) 21 break; 22 23 /* Is this the end? */ 24 if (entry & MPLS_LS_S_MASK) 25 return buf; 26 27 dest += len; 28 destlen -= len; 29 if (destlen) { 30 *dest = '/'; 31 dest++; 32 destlen--; 33 } 34 } 35 errno = -E2BIG; 36 return NULL; 37 } 38 39 const char *mpls_ntop(int af, const void *addr, char *buf, size_t buflen) 40 { 41 switch(af) { 42 case AF_MPLS: 43 errno = 0; 44 return mpls_ntop1((struct mpls_label *)addr, buf, buflen); 45 default: 46 errno = EAFNOSUPPORT; 47 } 48 49 return NULL; 50 } 51
