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Commit ed85054d authored by John Fastabend's avatar John Fastabend Committed by David S. Miller
Browse files

bpf: more SK_SKB selftests 



Tests packet read/writes and additional skb fields.

Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6fd28865

tools/testing/selftests/bpf/test_verifier.c

+98 −0
Original line number Diff line number Diff line
@@ -1118,6 +1118,104 @@ static struct bpf_test tests[] = { 
		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

	},

	{

		"invalid access of tc_classid for SK_SKB",

		.insns = {

			BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,

				    offsetof(struct __sk_buff, tc_classid)),

			BPF_EXIT_INSN(),

		},

		.result = REJECT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

		.errstr = "invalid bpf_context access",

	},

	{

		"check skb->mark is writeable by SK_SKB",

		.insns = {

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0,

				    offsetof(struct __sk_buff, mark)),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

	},

	{

		"check skb->tc_index is writeable by SK_SKB",

		.insns = {

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0,

				    offsetof(struct __sk_buff, tc_index)),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

	},

	{

		"check skb->priority is writeable by SK_SKB",

		.insns = {

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0,

				    offsetof(struct __sk_buff, priority)),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

	},

	{

		"direct packet read for SK_SKB",

		.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, 1),

			BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_2, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

	},

	{

		"direct packet write for SK_SKB",

		.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, 1),

			BPF_STX_MEM(BPF_B, BPF_REG_2, BPF_REG_2, 0),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

	},

	{

		"overlapping checks for direct packet access SK_SKB",

		.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, 4),

			BPF_MOV64_REG(BPF_REG_1, BPF_REG_2),

			BPF_ALU64_IMM(BPF_ADD, BPF_REG_1, 6),

			BPF_JMP_REG(BPF_JGT, BPF_REG_1, BPF_REG_3, 1),

			BPF_LDX_MEM(BPF_H, BPF_REG_0, BPF_REG_2, 6),

			BPF_MOV64_IMM(BPF_REG_0, 0),

			BPF_EXIT_INSN(),

		},

		.result = ACCEPT,

		.prog_type = BPF_PROG_TYPE_SK_SKB,

	},

	{

		"check skb->mark is not writeable by sockets",

		.insns = {