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if_vxlan(4): Exclude ETHER_CRC_LEN from macro VXLAN_MAX_MTU

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The encapsulated (original) frame does not count in FCS as per Section 5
of RFC 7348.

Reviewed by:	afedorov, bryanv, #network
Fixes:		b7592822d5 Allow set MTU more than 1500 bytes
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D45195
This commit is contained in:
Zhenlei Huang 2024-07-02 12:57:01 +08:00
parent f8a46de2dd
commit d6963b9ed3
1 changed files with 1 additions and 1 deletions
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2
sys/net/if_vxlan.c
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@ -97,7 +97,7 @@ 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