Index: bpf.h
===================================================================
RCS file: /cvs/src/sys/net/bpf.h,v
retrieving revision 1.69
diff -u -p -r1.69 bpf.h
--- bpf.h	18 Jun 2020 23:27:58 -0000	1.69
+++ bpf.h	16 Jul 2020 06:17:38 -0000
@@ -237,6 +237,7 @@ struct bpf_hdr {
 #define		BPF_MEM		0x60
 #define		BPF_LEN		0x80
 #define		BPF_MSH		0xa0
+#define		BPF_RND		0xc0
 
 /* alu/jmp fields */
 #define BPF_OP(code)	((code) & 0xf0)
Index: bpf_filter.c
===================================================================
RCS file: /cvs/src/sys/net/bpf_filter.c,v
retrieving revision 1.33
diff -u -p -r1.33 bpf_filter.c
--- bpf_filter.c	8 Sep 2017 05:36:53 -0000	1.33
+++ bpf_filter.c	16 Jul 2020 06:17:38 -0000
@@ -199,6 +199,14 @@ _bpf_filter(const struct bpf_insn *pc, c
 			X = wirelen;
 			continue;
 
+		case BPF_LD|BPF_W|BPF_RND:
+			A = arc4random();
+			continue;
+
+		case BPF_LDX|BPF_W|BPF_RND:
+			X = arc4random();
+			continue;
+
 		case BPF_LD|BPF_W|BPF_IND:
 			k = X + pc->k;
 			A = ops->ldw(pkt, k, &err);
@@ -414,6 +422,7 @@ bpf_validate(struct bpf_insn *f, int len
 					return 0;
 				break;
 			case BPF_LEN:
+			case BPF_RND:
 				break;
 			default:
 				return 0;