net/packet: generate ICMP destination unreachable packets

Updates tailscale/corp#34257 Signed-off-by: Fran Bull <fran@tailscale.com>
2026-07-20 07:33:00 -07:00
parent f65372c9ba
commit 8df4816be4
4 changed files with 261 additions and 0 deletions
@@ -49,6 +49,10 @@ type ICMP4Code uint8

 const (
 	ICMP4NoCode ICMP4Code = 0
+
+	// ICMP4HostUnreachable is the code used with ICMP4Unreachable to
+	// indicate that the destination host could not be reached.
+	ICMP4HostUnreachable ICMP4Code = 1
 )

 // ICMP4Header is an IPv4+ICMPv4 header.