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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:53:30 +0000 |
commit | 2c7cac91ed6e7db0f6937923d2b57f97dbdbc337 (patch) | |
tree | c05dc0f8e6aa3accc84e3e5cffc933ed94941383 /lib/mpls.c | |
parent | Initial commit. (diff) | |
download | frr-upstream.tar.xz frr-upstream.zip |
Adding upstream version 8.4.4.upstream/8.4.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/mpls.c')
-rw-r--r-- | lib/mpls.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/lib/mpls.c b/lib/mpls.c new file mode 100644 index 0000000..ac5792a --- /dev/null +++ b/lib/mpls.c @@ -0,0 +1,100 @@ +/* + * 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; +} |