From 882b74a295f8dbb2d55091e6ba5ebecab9800d4e Mon Sep 17 00:00:00 2001 From: Zhenlei Huang Date: Tue, 2 Jul 2024 12:57:01 +0800 Subject: [PATCH] if_vxlan(4): Exclude ETHER_CRC_LEN from macro VXLAN_MAX_MTU The encapsulated (original) frame does not count in FCS as per Section 5 of RFC 7348. Reviewed by: afedorov, bryanv, #network Fixes: b7592822d5de Allow set MTU more than 1500 bytes MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D45195 (cherry picked from commit d6963b9ed3287e91db3d1df153861591faff0007) --- sys/net/if_vxlan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/net/if_vxlan.c b/sys/net/if_vxlan.c index 87648abd116..7a8cf7acae5 100644 --- a/sys/net/if_vxlan.c +++ b/sys/net/if_vxlan.c @@ -98,7 +98,7 @@ struct vxlan_socket_mc_info { 60 /* Maximum IPv4 header len */ - \ sizeof(struct udphdr) - \ sizeof(struct vxlan_header) - \ - ETHER_HDR_LEN - ETHER_CRC_LEN - ETHER_VLAN_ENCAP_LEN) + ETHER_HDR_LEN - ETHER_VLAN_ENCAP_LEN) #define VXLAN_BASIC_IFCAPS (IFCAP_LINKSTATE | IFCAP_JUMBO_MTU) #define VXLAN_SO_MC_MAX_GROUPS 32