/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#include <netinet/icmp6.h>
+
#include "ndisc-protocol.h"
+int ndisc_option_parse(
+ ICMP6Packet *p,
+ size_t offset,
+ uint8_t *ret_type,
+ size_t *ret_len,
+ const uint8_t **ret_opt) {
+
+ assert(p);
+
+ if (offset == p->raw_size)
+ return -ESPIPE; /* end of the packet */
+
+ if (offset > p->raw_size)
+ return -EBADMSG;
+
+ if (p->raw_size - offset < sizeof(struct nd_opt_hdr))
+ return -EBADMSG;
+
+ const struct nd_opt_hdr *hdr = (const struct nd_opt_hdr*) (p->raw_packet + offset);
+ if (hdr->nd_opt_len == 0)
+ return -EBADMSG;
+
+ size_t len = hdr->nd_opt_len * 8;
+ if (p->raw_size - offset < len)
+ return -EBADMSG;
+
+ if (ret_type)
+ *ret_type = hdr->nd_opt_type;
+ if (ret_len)
+ *ret_len = len;
+ if (ret_opt)
+ *ret_opt = p->raw_packet + offset;
+
+ return 0;
+}
+
static const uint8_t prefix_length_code_to_prefix_length[_PREFIX_LENGTH_CODE_MAX] = {
[PREFIX_LENGTH_CODE_96] = 96,
[PREFIX_LENGTH_CODE_64] = 64,
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
+#include "icmp6-packet.h"
#include "time-util.h"
/* RFC 8781: PREF64 or (NAT64 prefix) */
int pref64_plc_to_prefix_length(uint16_t plc, uint8_t *ret);
int pref64_prefix_length_to_plc(uint8_t prefixlen, uint8_t *ret);
+
+int ndisc_option_parse(
+ ICMP6Packet *p,
+ size_t offset,
+ uint8_t *ret_type,
+ size_t *ret_len,
+ const uint8_t **ret_opt);