--- zzzz-none-000/linux-4.4.271/include/uapi/linux/igmp.h	2021-06-03 06:22:09.000000000 +0000
+++ dakota-7530ac-750/linux-4.4.271/include/uapi/linux/igmp.h	2023-01-11 09:25:43.000000000 +0000
@@ -32,7 +32,7 @@
 	__u8 code;		/* For newer IGMP */
 	__sum16 csum;
 	__be32 group;
-};
+} __attribute__((packed, aligned(2)));
 
 /* V3 group record types [grec_type] */
 #define IGMPV3_MODE_IS_INCLUDE		1
@@ -48,7 +48,7 @@
 	__be16	grec_nsrcs;
 	__be32	grec_mca;
 	__be32	grec_src[0];
-};
+} __attribute__((packed, aligned(2)));
 
 struct igmpv3_report {
 	__u8 type;
@@ -57,7 +57,7 @@
 	__be16 resv2;
 	__be16 ngrec;
 	struct igmpv3_grec grec[0];
-};
+} __attribute__((packed, aligned(2)));
 
 struct igmpv3_query {
 	__u8 type;
@@ -78,7 +78,7 @@
 	__u8 qqic;
 	__be16 nsrcs;
 	__be32 srcs[0];
-};
+} __attribute__((packed, aligned(2)));
 
 #define IGMP_HOST_MEMBERSHIP_QUERY	0x11	/* From RFC1112 */
 #define IGMP_HOST_MEMBERSHIP_REPORT	0x12	/* Ditto */