Commit 7d95b0ab authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

bpf: add test cases for direct packet access 



Add couple of test cases for direct write and the negative size issue, and
also adjust the direct packet access test4 since it asserts that writes are
not possible, but since we've just added support for writes, we need to
invert the verdict to ACCEPT, of course. Summary: 133 PASSED, 0 FAILED.

Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 36bbef52

samples/bpf/test_verifier.c

+430 −3
Original line number Diff line number Diff line
@@ -290,6 +290,29 @@ static struct bpf_test tests[] = { 
		.errstr = "invalid read from stack",

		.result = REJECT,

	},

	{

		"invalid argument register",

		.insns = {

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_cgroup_classid),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_cgroup_classid),

			BPF_EXIT_INSN(),

		},

		.errstr = "R1 !read_ok",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"non-invalid argument register",

		.insns = {

			BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_1),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_cgroup_classid),

			BPF_ALU64_REG(BPF_MOV, BPF_REG_1, BPF_REG_6),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_get_cgroup_classid),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"check valid spill/fill",

		.insns = {
@@ -1209,6 +1232,54 @@ static struct bpf_test tests[] = { 
		.errstr = "invalid read from stack off -8+0 size 8",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"raw_stack: skb_load_bytes, negative len",

		.insns = {

			BPF_MOV64_IMM(BPF_REG_2, 4),

			BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),

			BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_4, -8),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid stack type R3",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"raw_stack: skb_load_bytes, negative len 2",

		.insns = {

			BPF_MOV64_IMM(BPF_REG_2, 4),

			BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),

			BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_4, ~0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid stack type R3",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"raw_stack: skb_load_bytes, zero len",

		.insns = {

			BPF_MOV64_IMM(BPF_REG_2, 4),

			BPF_ALU64_REG(BPF_MOV, BPF_REG_6, BPF_REG_10),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, -8),

			BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),

			BPF_LDX_MEM(BPF_DW, BPF_REG_0, BPF_REG_6, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid stack type R3",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"raw_stack: skb_load_bytes, no init",

		.insns = {
@@ -1511,7 +1582,7 @@ static struct bpf_test tests[] = { 
		.prog_type = BPF_PROG_TYPE_SOCKET_FILTER,

	},

	{

		"direct packet access: test4",

		"direct packet access: test4 (write)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),
@@ -1524,8 +1595,7 @@ static struct bpf_test tests[] = { 
			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "cannot write",

		.result = REJECT,

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{
@@ -1630,6 +1700,26 @@ static struct bpf_test tests[] = { 
		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"direct packet access: test10 (write invalid)",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_REG(BPF_REG_0, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_0, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_0, BPF_REG_3, 2),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

			BPF_STX_MEM(BPF_B, BPF_REG_2, BPF_REG_2, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.errstr = "invalid access to packet",

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test1, valid packet_ptr range",

		.insns = {
@@ -1736,6 +1826,343 @@ static struct bpf_test tests[] = { 
		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_XDP,

	},

	{

		"helper access to packet: test6, cls valid packet_ptr range",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 5),

			BPF_LD_MAP_FD(BPF_REG_1, 0),

			BPF_MOV64_REG(BPF_REG_3, BPF_REG_2),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_update_elem),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.fixup = {5},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test7, cls unchecked packet_ptr",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LD_MAP_FD(BPF_REG_1, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.fixup = {1},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test8, cls variable add",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

					offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

					offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_REG(BPF_REG_4, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_3, 10),

			BPF_LDX_MEM(BPF_B, BPF_REG_5, BPF_REG_2, 0),

			BPF_MOV64_REG(BPF_REG_4, BPF_REG_2),

			BPF_ALU64_REG(BPF_ADD, BPF_REG_4, BPF_REG_5),

			BPF_MOV64_REG(BPF_REG_5, BPF_REG_4),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_5, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_5, BPF_REG_3, 4),

			BPF_LD_MAP_FD(BPF_REG_1, 0),

			BPF_MOV64_REG(BPF_REG_2, BPF_REG_4),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.fixup = {11},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test9, cls packet_ptr with bad range",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_REG(BPF_REG_4, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 4),

			BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_3, 2),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

			BPF_LD_MAP_FD(BPF_REG_1, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.fixup = {7},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test10, cls packet_ptr with too short range",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_2, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_3, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, 1),

			BPF_MOV64_REG(BPF_REG_4, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_4, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_4, BPF_REG_3, 3),

			BPF_LD_MAP_FD(BPF_REG_1, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.fixup = {6},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test11, cls unsuitable helper 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_3, BPF_REG_7, 4),

			BPF_MOV64_IMM(BPF_REG_2, 0),

			BPF_MOV64_IMM(BPF_REG_4, 42),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_store_bytes),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "helper access to the packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test12, cls unsuitable helper 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_MOV64_REG(BPF_REG_3, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 8),

			BPF_JMP_REG(BPF_JGT, BPF_REG_6, BPF_REG_7, 3),

			BPF_MOV64_IMM(BPF_REG_2, 0),

			BPF_MOV64_IMM(BPF_REG_4, 4),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_skb_load_bytes),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "helper access to the packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test13, cls helper ok",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_2, 4),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test14, cls helper fail sub",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_ALU64_IMM(BPF_SUB, BPF_REG_1, 4),

			BPF_MOV64_IMM(BPF_REG_2, 4),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "type=inv expected=fp",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test15, cls helper fail range 1",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_2, 8),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test16, cls helper fail range 2",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_2, -9),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test17, cls helper fail range 3",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_2, ~0),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test18, cls helper fail range zero",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_MOV64_IMM(BPF_REG_2, 0),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test19, pkt end as input",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_7),

			BPF_MOV64_IMM(BPF_REG_2, 4),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "R1 type=pkt_end expected=fp",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

	{

		"helper access to packet: test20, wrong reg",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_6, BPF_REG_1,

				    offsetof(struct __sk_buff, data)),

			BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_1,

				    offsetof(struct __sk_buff, data_end)),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_6, 1),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 7),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_7, 6),

			BPF_MOV64_IMM(BPF_REG_2, 4),

			BPF_MOV64_IMM(BPF_REG_3, 0),

			BPF_MOV64_IMM(BPF_REG_4, 0),

			BPF_MOV64_IMM(BPF_REG_5, 0),

			BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_csum_diff),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.errstr = "invalid access to packet",

		.prog_type = BPF_PROG_TYPE_SCHED_CLS,

	},

};



static int probe_filter_length(struct bpf_insn *fp)

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