extract icmp into its own static library; replace all __attribute__((constructor)) self-registrations with explicit init() calls in dispatch_init

include/icmp.h

@@ -1,40 +0,0 @@
-#pragma once
-#include <cstdint>
-#include <span>
-#include "eth.h"
-#include "ipv4.h"
-#include "span_writer.h"
-
-namespace icmp {
-
-struct __attribute__((packed)) echo {
-    uint8_t type;
-    uint8_t code;
-    uint16_t checksum;
-    uint16_t id;
-    uint16_t seq;
-};
-static_assert(sizeof(echo) == 8);
-
-void handle(std::span<const uint8_t> frame, span_writer& tx);
-
-template <typename Buf>
-void prepend_echo_request(Buf& buf,
-                          eth::mac_addr src_mac, ipv4::ip4_addr src_ip,
-                          eth::mac_addr dst_mac, ipv4::ip4_addr dst_ip,
-                          uint16_t id, uint16_t seq,
-                          size_t payload_len = 0) {
-    auto* e = buf.template prepend<echo>();
-    e->type = 8;
-    e->code = 0;
-    e->checksum = 0;
-    e->id = id;
-    e->seq = seq;
-    size_t icmp_len = sizeof(echo) + payload_len;
-    e->checksum = ipv4::checksum(e, icmp_len);
-    ipv4::prepend(buf, dst_mac, src_mac, src_ip, dst_ip, 1, icmp_len);
-}
-
-bool parse_echo_reply(std::span<const uint8_t> frame, ipv4::ip4_addr& src_ip, uint16_t expected_id);
-
-} // namespace icmp

include/igmp.h

@@ -17,6 +17,8 @@ struct __attribute__((packed)) message {
 };
 static_assert(sizeof(message) == 8);
 
+void init();
+
 eth::mac_addr mac_for_ip(const ipv4::ip4_addr& group);
 bool is_member(const ipv4::ip4_addr& ip);
 bool is_member_mac(const eth::mac_addr& mac);

include/udp.h

@@ -36,6 +36,7 @@ void prepend(Buf& buf, const eth::mac_addr& dst_mac, const eth::mac_addr& src_ma
     ipv4::prepend(buf, dst_mac, src_mac, src_ip, dst_ip, 17, sizeof(header) + payload_len, ttl);
 }
 
+void init();
 void handle(std::span<const uint8_t> frame, span_writer& tx);
 
 using port_handler = void (*)(std::span<const uint8_t> payload, const address& from);