[glibc] hurd: Add ETH_TLEN and ETH_FCS_LEN

[Samuel Thibault]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=89b4605be88a10256a41f010a636df5d2b0fe2bd

commit 89b4605be88a10256a41f010a636df5d2b0fe2bd
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Wed Jun 17 01:25:49 2026 +0200

    hurd: Add ETH_TLEN and ETH_FCS_LEN

Diff:
---
 sysdeps/mach/hurd/net/if_ether.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sysdeps/mach/hurd/net/if_ether.h b/sysdeps/mach/hurd/net/if_ether.h
index 88b8d03f35..7709012556 100644
--- a/sysdeps/mach/hurd/net/if_ether.h
+++ b/sysdeps/mach/hurd/net/if_ether.h
@@ -24,10 +24,12 @@
  */
 
 #define ETH_ALEN	6		/* Octets in one ethernet addr	 */
+#define ETH_TLEN	2		/* Octets in ethernet type field */
 #define ETH_HLEN	14		/* Total octets in header.	 */
 #define ETH_ZLEN	60		/* Min. octets in frame sans FCS */
 #define ETH_DATA_LEN	1500		/* Max. octets in payload	 */
 #define ETH_FRAME_LEN	1514		/* Max. octets in frame sans FCS */
+#define ETH_FCS_LEN	4		/* Octets in the FCS		 */
 
 /*
  *	These are the defined Ethernet Protocol ID's.