netdev - [PATCH bpf-next 2/9] bpf: Test bpf_tcp_enter_cwr in test

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Date:   Mon, 18 Feb 2019 21:38:31 -0800
From:   brakmo <brakmo@...com>
To:     netdev <netdev@...r.kernel.org>
CC:     Martin Lau <kafai@...com>, Alexei Starovoitov <ast@...com>,
        Daniel Borkmann --cc=Kernel Team 
        <"daniel@...earbox.netKernel-team"@fb.com>
Subject: [PATCH bpf-next 2/9] bpf: Test bpf_tcp_enter_cwr in test_verifier

This test ensures the verifier has checked the arg1 of
BPF_FUNC_tcp_enter_cwr is of ARG_PTR_TO_TCP_SOCK type.

Signed-off-by: Martin KaFai Lau <kafai@...com>
Signed-off-by: Lawrence Brakmo <brakmo@...com>
---
 tools/testing/selftests/bpf/verifier/sock.c | 33 +++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/tools/testing/selftests/bpf/verifier/sock.c b/tools/testing/selftests/bpf/verifier/sock.c
index 0ddfdf76aba5..b07a083eeb59 100644
--- a/tools/testing/selftests/bpf/verifier/sock.c
+++ b/tools/testing/selftests/bpf/verifier/sock.c
@@ -382,3 +382,36 @@
 	.result = REJECT,
 	.errstr = "type=tcp_sock expected=sock",
 },
+{
+	"bpf_tcp_enter_cwr(skb->sk)",
+	.insns = {
+	BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	BPF_EMIT_CALL(BPF_FUNC_tcp_enter_cwr),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+	.result = REJECT,
+	.errstr = "type=sock_common expected=tcp_sock",
+},
+{
+	"bpf_tcp_enter_cwr(bpf_tcp_sock(skb->sk))",
+	.insns = {
+	BPF_LDX_MEM(BPF_DW, BPF_REG_1, BPF_REG_1, offsetof(struct __sk_buff, sk)),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_1, 0, 2),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	BPF_EMIT_CALL(BPF_FUNC_tcp_sock),
+	BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 1),
+	BPF_EXIT_INSN(),
+	BPF_MOV64_REG(BPF_REG_1, BPF_REG_0),
+	BPF_EMIT_CALL(BPF_FUNC_tcp_enter_cwr),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+	.result = ACCEPT,
+},
-- 
2.17.1