LXR iproute2/lib/mpls

   1/* SPDX-License-Identifier: GPL-2.0 */
   2
   3#include <errno.h>
   4#include <string.h>
   5#include <sys/types.h>
   6#include <netinet/in.h>
   7#include <linux/mpls.h>
   8
   9#include "utils.h"
  10
  11
  12static int mpls_pton1(const char *name, struct mpls_label *addr,
  13                      unsigned int maxlabels)
  14{
  15        char *endp;
  16        unsigned count;
  17
  18        for (count = 0; count < maxlabels; count++) {
  19                unsigned long label;
  20
  21                label = strtoul(name, &endp, 0);
  22                /* Fail when the label value is out or range */
  23                if (label >= (1 << 20))
  24                        return 0;
  25
  26                if (endp == name) /* no digits */
  27                        return 0;
  28
  29                addr->entry = htonl(label << MPLS_LS_LABEL_SHIFT);
  30                if (*endp == '\0') {
  31                        addr->entry |= htonl(1 << MPLS_LS_S_SHIFT);
  32                        return 1;
  33                }
  34
  35                /* Bad character in the address */
  36                if (*endp != '/')
  37                        return 0;
  38
  39                name = endp + 1;
  40                addr += 1;
  41        }
  42        /* The address was too long */
  43        fprintf(stderr, "Error: too many labels.\n");
  44        return 0;
  45}
  46
  47int mpls_pton(int af, const char *src, void *addr, size_t alen)
  48{
  49        unsigned int maxlabels = alen / sizeof(struct mpls_label);
  50        int err;
  51
  52        switch(af) {
  53        case AF_MPLS:
  54                errno = 0;
  55                err = mpls_pton1(src, (struct mpls_label *)addr, maxlabels);
  56                break;
  57        default:
  58                errno = EAFNOSUPPORT;
  59                err = -1;
  60        }
  61
  62        return err;
  63}
  64