41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
#pragma once
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#include <cstdint>
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#include <span>
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#include "eth.h"
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#include "ipv4.h"
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#include "span_writer.h"
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namespace icmp {
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struct __attribute__((packed)) echo {
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uint8_t type;
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uint8_t code;
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uint16_t checksum;
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uint16_t id;
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uint16_t seq;
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};
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static_assert(sizeof(echo) == 8);
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void handle(std::span<const uint8_t> frame, span_writer& tx);
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template <typename Buf>
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void prepend_echo_request(Buf& buf,
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eth::mac_addr src_mac, ipv4::ip4_addr src_ip,
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eth::mac_addr dst_mac, ipv4::ip4_addr dst_ip,
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uint16_t id, uint16_t seq,
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size_t payload_len = 0) {
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auto* e = buf.template prepend<echo>();
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e->type = 8;
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e->code = 0;
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e->checksum = 0;
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e->id = id;
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e->seq = seq;
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size_t icmp_len = sizeof(echo) + payload_len;
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e->checksum = ipv4::checksum(e, icmp_len);
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ipv4::prepend(buf, dst_mac, src_mac, src_ip, dst_ip, 1, icmp_len);
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}
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bool parse_echo_reply(std::span<const uint8_t> frame, ipv4::ip4_addr& src_ip, uint16_t expected_id);
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} // namespace icmp
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