From: Willem de Bruijn <willemb@google.com>
Date: Tue, 3 Mar 2020 15:05:03 -0500
Subject: selftests/bpf: Test new __sk_buff field gso_size
Patch-mainline: v5.7-rc1
Git-commit: 62511ceadf6e217f09d4ab1f9198d2bb5cc70e7c
References: bsc#1177028

Analogous to the gso_segs selftests introduced in commit d9ff286a0f59
("bpf: allow BPF programs access skb_shared_info->gso_segs field").

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200303200503.226217-4-willemdebruijn.kernel@gmail.com
Acked-by: Gary Lin <glin@suse.com>
---
 tools/testing/selftests/bpf/prog_tests/skb_ctx.c |    1 
 tools/testing/selftests/bpf/progs/test_skb_ctx.c |    2 
 tools/testing/selftests/bpf/verifier/ctx_skb.c   |   47 +++++++++++++++++++++++
 3 files changed, 50 insertions(+)

--- a/tools/testing/selftests/bpf/prog_tests/skb_ctx.c
+++ b/tools/testing/selftests/bpf/prog_tests/skb_ctx.c
@@ -14,6 +14,7 @@ void test_skb_ctx(void)
 		.wire_len = 100,
 		.gso_segs = 8,
 		.mark = 9,
+		.gso_size = 10,
 	};
 	struct bpf_prog_test_run_attr tattr = {
 		.data_in = &pkt_v4,
--- a/tools/testing/selftests/bpf/progs/test_skb_ctx.c
+++ b/tools/testing/selftests/bpf/progs/test_skb_ctx.c
@@ -23,6 +23,8 @@ int process(struct __sk_buff *skb)
 		return 1;
 	if (skb->gso_segs != 8)
 		return 1;
+	if (skb->gso_size != 10)
+		return 1;
 
 	return 0;
 }
--- a/tools/testing/selftests/bpf/verifier/ctx_skb.c
+++ b/tools/testing/selftests/bpf/verifier/ctx_skb.c
@@ -1011,6 +1011,53 @@
 	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
 },
 {
+	"read gso_size from CGROUP_SKB",
+	.insns = {
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+		    offsetof(struct __sk_buff, gso_size)),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.result = ACCEPT,
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"read gso_size from CGROUP_SKB",
+	.insns = {
+	BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1,
+		    offsetof(struct __sk_buff, gso_size)),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.result = ACCEPT,
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"write gso_size from CGROUP_SKB",
+	.insns = {
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0,
+		    offsetof(struct __sk_buff, gso_size)),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.result = REJECT,
+	.result_unpriv = REJECT,
+	.errstr = "invalid bpf_context access off=176 size=4",
+	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,
+},
+{
+	"read gso_size from CLS",
+	.insns = {
+	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,
+		    offsetof(struct __sk_buff, gso_size)),
+	BPF_MOV64_IMM(BPF_REG_0, 0),
+	BPF_EXIT_INSN(),
+	},
+	.result = ACCEPT,
+	.prog_type = BPF_PROG_TYPE_SCHED_CLS,
+},
+{
 	"check wire_len is not readable by sockets",
 	.insns = {
 		BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,