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diff --git a/sys/net/ethernet.h b/sys/net/ethernet.h
index cf4f75bd0b6c..01485cf26e06 100644
--- a/sys/net/ethernet.h
+++ b/sys/net/ethernet.h
@@ -62,6 +62,8 @@ struct ether_header {
u_char ether_shost[ETHER_ADDR_LEN];
u_short ether_type;
} __packed;
+_Static_assert(sizeof(struct ether_header) == ETHER_HDR_LEN,
+ "size of struct ether_header is wrong");
/*
* Structure of a 48-bit Ethernet address.
@@ -69,6 +71,8 @@ struct ether_header {
struct ether_addr {
u_char octet[ETHER_ADDR_LEN];
} __packed;
+_Static_assert(sizeof(struct ether_addr) == ETHER_ADDR_LEN,
+ "size of struct ether_addr is wrong");
#define ETHER_IS_MULTICAST(addr) (*(addr) & 0x01) /* is address mcast/bcast? */
#define ETHER_IS_IPV6_MULTICAST(addr) \
@@ -112,6 +116,8 @@ struct ether_vlan_header {
uint16_t evl_tag;
uint16_t evl_proto;
} __packed;
+_Static_assert(sizeof(struct ether_vlan_header) == ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN,
+ "size of struct ether_vlan_header is wrong");
#define EVL_VLID_MASK 0x0FFF
#define EVL_PRI_MASK 0xE000
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
index 7be4dfac23e7..3ae0c01c0efc 100644
--- a/sys/net/if_ethersubr.c
+++ b/sys/net/if_ethersubr.c
@@ -92,11 +92,6 @@
#include <crypto/sha1.h>
-#ifdef CTASSERT
-CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
-CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
-#endif
-
VNET_DEFINE(pfil_head_t, link_pfil_head); /* Packet filter hooks */
/* netgraph node hooks for ng_ether(4) */
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