Blame lib/mpls_pton.c

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/* SPDX-License-Identifier: GPL-2.0 */
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <linux/mpls.h>
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#include "utils.h"
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static int mpls_pton1(const char *name, struct mpls_label *addr,
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		      unsigned int maxlabels)
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{
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	char *endp;
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	unsigned count;
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	for (count = 0; count < maxlabels; count++) {
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		unsigned long label;
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		label = strtoul(name, &endp, 0);
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		/* Fail when the label value is out or range */
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		if (label >= (1 << 20))
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			return 0;
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		if (endp == name) /* no digits */
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			return 0;
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		addr->entry = htonl(label << MPLS_LS_LABEL_SHIFT);
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		if (*endp == '\0') {
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			addr->entry |= htonl(1 << MPLS_LS_S_SHIFT);
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			return 1;
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		}
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		/* Bad character in the address */
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		if (*endp != '/')
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			return 0;
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		name = endp + 1;
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		addr += 1;
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	}
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	/* The address was too long */
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	fprintf(stderr, "Error: too many labels.\n");
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	return 0;
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}
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int mpls_pton(int af, const char *src, void *addr, size_t alen)
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{
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	unsigned int maxlabels = alen / sizeof(struct mpls_label);
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	int err;
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	switch(af) {
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	case AF_MPLS:
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		errno = 0;
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		err = mpls_pton1(src, (struct mpls_label *)addr, maxlabels);
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		break;
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	default:
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		errno = EAFNOSUPPORT;
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		err = -1;
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	}
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	return err;
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}