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/*
* mpls functions
*
* Copyright (C) 2018 Cumulus Networks, Inc.
* Donald Sharp
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include <mpls.h>
#include <memory.h>
/*
* String to label conversion, labels separated by '/'.
*
* @param label_str labels separated by /
* @param num_labels number of labels; zero if conversion was unsuccessful
* @param labels preallocated mpls_label_t array of size MPLS_MAX_LABELS; only
* modified if the conversion succeeded
* @return 0 on success
* -1 if the string could not be parsed as integers
* -2 if a label was inside the reserved range (0-15)
* -3 if the number of labels given exceeds MPLS_MAX_LABELS
*/
int mpls_str2label(const char *label_str, uint8_t *num_labels,
mpls_label_t *labels)
{
char *ostr; // copy of label string (start)
char *lstr; // copy of label string
char *nump; // pointer to next segment
char *endp; // end pointer
int i; // for iterating label_str
int rc; // return code
mpls_label_t pl[MPLS_MAX_LABELS]; // parsed labels
/* labels to zero until we have a successful parse */
ostr = lstr = XSTRDUP(MTYPE_TMP, label_str);
*num_labels = 0;
rc = 0;
for (i = 0; i < MPLS_MAX_LABELS && lstr && !rc; i++) {
nump = strsep(&lstr, "/");
pl[i] = strtoul(nump, &endp, 10);
/* format check */
if (*endp != '\0')
rc = -1;
/* validity check */
else if (!IS_MPLS_UNRESERVED_LABEL(pl[i]))
rc = -2;
}
/* excess labels */
if (!rc && i == MPLS_MAX_LABELS && lstr)
rc = -3;
if (!rc) {
*num_labels = i;
memcpy(labels, pl, *num_labels * sizeof(mpls_label_t));
}
XFREE(MTYPE_TMP, ostr);
return rc;
}
/*
* Label to string conversion, labels in string separated by '/'.
*/
char *mpls_label2str(uint8_t num_labels, const mpls_label_t *labels, char *buf,
int len, int pretty)
{
char label_buf[BUFSIZ];
int i;
buf[0] = '\0';
for (i = 0; i < num_labels; i++) {
if (i != 0)
strlcat(buf, "/", len);
if (pretty)
label2str(labels[i], label_buf, sizeof(label_buf));
else
snprintf(label_buf, sizeof(label_buf), "%u", labels[i]);
strlcat(buf, label_buf, len);
}
return buf;
}
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