Add a test case for null filter.

svn path=/head/; revision=182221

tools/regression/bpf/bpf_filter/Makefile

@@ -19,7 +19,7 @@ TEST_CASES?=	test0001 test0002 test0003 test0004	\
 		test0065 test0066 test0067 test0068	\
 		test0069 test0070 test0071 test0072	\
 		test0073 test0074 test0075 test0076	\
-		test0077 test0078
+		test0077 test0078 test0079
 
 SYSDIR?=	${.CURDIR}/../../../../sys
 
@@ -37,7 +37,8 @@ CFLAGS+=	-DLOG_LEVEL="${LOG_LEVEL}"
 CFLAGS+=	-DBPF_VALIDATE=${BPF_VALIDATE}
 .endif
 
-.if (${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386") && defined(BPF_JIT)
+.if defined(BPF_JIT) &&	\
+    (${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386")
 SRCS+=		${SYSDIR}/net/bpf_jitter.c	\
 		${SYSDIR}/${MACHINE_ARCH}/${MACHINE_ARCH}/bpf_jit_machdep.c
 CFLAGS+=	-DBPF_JIT_COMPILER
@@ -49,7 +50,8 @@ WARNS?=		2
 
 .for TEST in ${TEST_CASES}
 ${TEST}:	${.CURDIR}/tests/${TEST}.h ${SRCS}
-	@${CC} ${CFLAGS} -DBPF_TEST_H=\"${TEST}.h\" -o ${.CURDIR}/${TEST} ${SRCS}
+	@${CC} ${CFLAGS} -DBPF_TEST_H=\"${TEST}.h\"	\
+	    -o ${.CURDIR}/${TEST} ${SRCS}
 .endfor
 
 all:		${TEST_CASES}

tools/regression/bpf/bpf_filter/bpf_test.c

@@ -52,10 +52,7 @@ __FBSDID("$FreeBSD$");
 
 static void	sig_handler(int);
 
-#if defined(BPF_JIT_COMPILER) || defined(BPF_VALIDATE)
 static int	nins = sizeof(pc) / sizeof(pc[0]);
-#endif
-
 static int	verbose = LOG_LEVEL;
 
 #ifdef BPF_JIT_COMPILER
@@ -68,10 +65,6 @@ bpf_compile_and_filter(void)
 	bpf_jit_filter	*filter;
 	u_int		i, ret;
 
-	/* Do not use BPF JIT compiler for an empty program */
-	if (nins == 0)
-		return (0);
-
 	/* Compile the BPF filter program and generate native code. */
 	if ((filter = bpf_jitter(pc, nins)) == NULL) {
 		if (verbose > 1)
@@ -263,7 +256,7 @@ main(void)
 	ret = bpf_compile_and_filter();
 #else
 	for (i = 0; i < BPF_NRUNS; i++)
-		ret = bpf_filter(pc, pkt, wirelen, buflen);
+		ret = bpf_filter(nins != 0 ? pc : NULL, pkt, wirelen, buflen);
 #endif
 	if (ret != expect) {
 		if (verbose > 1)

tools/regression/bpf/bpf_filter/tests/test0079.h

@@ -0,0 +1,29 @@
+/*-
+ * Test 0079:	An empty filter program.
+ *
+ * $FreeBSD$
+ */
+
+/* BPF program */
+struct bpf_insn pc[] = {
+};
+
+/* Packet */
+u_char	pkt[] = {
+	0x00,
+};
+
+/* Packet length seen on wire */
+u_int	wirelen =	sizeof(pkt);
+
+/* Packet length passed on buffer */
+u_int	buflen =	sizeof(pkt);
+
+/* Invalid instruction */
+int	invalid =	0;
+
+/* Expected return value */
+u_int	expect =	(u_int)-1;
+
+/* Expeced signal */
+int	expect_signal =	0;