bpf: add mod default A and X test cases

When running "mod X" operation, if X is 0 the filter has to be halt. Add new test cases to cover A = A mod X if X is 0, and A = A mod 1. CC: Xi Wang <[email protected]> CC: Zi Shen Lim <[email protected]> Signed-off-by: Yang Shi <[email protected]> Acked-by: Daniel Borkmann <[email protected]> Acked-by: Alexei Starovoitov <[email protected]> Acked-by: Zi Shen Lim <[email protected]> Acked-by: Xi Wang <[email protected]> Signed-off-by: David S. Miller <[email protected]>
iegor · Nov 5, 2015 · d4e4bc1 · d4e4bc1
1 parent df761ea
commit d4e4bc1
Showing 1 changed file with 30 additions and 0 deletions.
diff --git a/lib/test_bpf.c b/lib/test_bpf.c
@@ -5055,6 +5055,36 @@ static struct bpf_test tests[] = {
 		{},
 		{ {0x1, 0x0 } },
 	},
+	{
+		"MOD default X",
+		.u.insns = {
+			/*
+			 * A = 0x42
+			 * A = A mod X ; this halt the filter execution if X is 0
+			 * ret 0x42
+			 */
+			BPF_STMT(BPF_LD | BPF_IMM, 0x42),
+			BPF_STMT(BPF_ALU | BPF_MOD | BPF_X, 0),
+			BPF_STMT(BPF_RET | BPF_K, 0x42),
+		},
+		CLASSIC | FLAG_NO_DATA,
+		{},
+		{ {0x1, 0x0 } },
+	},
+	{
+		"MOD default A",
+		.u.insns = {
+			/*
+			 * A = A mod 1
+			 * ret A
+			 */
+			BPF_STMT(BPF_ALU | BPF_MOD | BPF_K, 0x1),
+			BPF_STMT(BPF_RET | BPF_A, 0x0),
+		},
+		CLASSIC | FLAG_NO_DATA,
+		{},
+		{ {0x1, 0x0 } },
+	},
 	{
 		"JMP EQ default A",
 		.u.insns = {