Index: gencode.c
===================================================================
RCS file: /cvs/src/lib/libpcap/gencode.c,v
diff -u -p -r1.67 gencode.c
--- gencode.c	15 Sep 2024 07:14:58 -0000	1.67
+++ gencode.c	5 Jun 2025 05:51:30 -0000
@@ -768,12 +768,14 @@ init_linktype(int type)
 		off_nl = 12;
 		return;
 
-	case DLT_USBPCAP:
-		/* FALLTHROUGH */
 	case DLT_RAW:
-		off_linktype = -1;
+		off_linktype = 0;
 		off_nl = 0;
 		return;
+	case DLT_USBPCAP:
+		off_linktype = -1;
+		off_nl = 0;
+		break;
 	}
 	bpf_error("unknown data link type 0x%x", linktype);
 	/* NOTREACHED */
@@ -910,6 +912,38 @@ gen_linktype(int proto)
 		return (gen_cmp(0, BPF_W, (bpf_int32)v));
 		break;
 	}
+	case DLT_RAW: {
+		struct slist *s0, *s1;
+		struct block *b;
+		int v;
+
+		switch (proto) {
+		case ETHERTYPE_IP:
+			v = 4;
+			break;
+		case ETHERTYPE_IPV6:
+			v = 6;
+			break;
+		default:
+			return gen_false();
+		}
+
+		/* A = p[X+off_linktype] */
+		s0 = new_stmt(BPF_LD|BPF_B|BPF_IND);
+		s0->s.k = off_linktype;
+
+		/* A = A >> 4 */
+		s1 = new_stmt(BPF_ALU|BPF_RSH|BPF_K);
+		s1->s.k = 4;
+		sappend(s0, s1);
+
+		b0 = new_block(JMP(BPF_JEQ));
+		b0->stmts = s0;
+		b0->s.k = v;
+
+		return (b0);
+	}
+
 	case DLT_PFLOG:
 		if (proto == ETHERTYPE_IP)
 			return (gen_cmp(offsetof(struct pfloghdr, af), BPF_B,