Commit 2cf1ad75 authored by Nicolas Schichan's avatar Nicolas Schichan Committed by David S. Miller
Browse files

test_bpf: test LD_ABS and LD_IND instructions on fragmented skbs. 



These new tests exercise various load sizes and offsets crossing the
head/fragment boundary.

Signed-off-by: default avatarNicolas Schichan <nschichan@freebox.fr>
Acked-by: default avatarAlexei Starovoitov <ast@plumgrid.com>
Acked-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bac142ac

lib/test_bpf.c

+142 −0
Original line number Diff line number Diff line
@@ -4493,6 +4493,148 @@ static struct bpf_test tests[] = { 
		{ { 1, 0xbef } },

		.fill_helper = bpf_fill_ld_abs_vlan_push_pop,

	},

	/*

	 * LD_IND / LD_ABS on fragmented SKBs

	 */

	{

		"LD_IND byte frag",

		.u.insns = {

			BPF_STMT(BPF_LDX | BPF_IMM, 0x40),

			BPF_STMT(BPF_LD | BPF_IND | BPF_B, 0x0),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ },

		{ {0x40, 0x42} },

		.frag_data = {

			0x42, 0x00, 0x00, 0x00,

			0x43, 0x44, 0x00, 0x00,

			0x21, 0x07, 0x19, 0x83,

		},

	},

	{

		"LD_IND halfword frag",

		.u.insns = {

			BPF_STMT(BPF_LDX | BPF_IMM, 0x40),

			BPF_STMT(BPF_LD | BPF_IND | BPF_H, 0x4),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ },

		{ {0x40, 0x4344} },

		.frag_data = {

			0x42, 0x00, 0x00, 0x00,

			0x43, 0x44, 0x00, 0x00,

			0x21, 0x07, 0x19, 0x83,

		},

	},

	{

		"LD_IND word frag",

		.u.insns = {

			BPF_STMT(BPF_LDX | BPF_IMM, 0x40),

			BPF_STMT(BPF_LD | BPF_IND | BPF_W, 0x8),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ },

		{ {0x40, 0x21071983} },

		.frag_data = {

			0x42, 0x00, 0x00, 0x00,

			0x43, 0x44, 0x00, 0x00,

			0x21, 0x07, 0x19, 0x83,

		},

	},

	{

		"LD_IND halfword mixed head/frag",

		.u.insns = {

			BPF_STMT(BPF_LDX | BPF_IMM, 0x40),

			BPF_STMT(BPF_LD | BPF_IND | BPF_H, -0x1),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ [0x3e] = 0x25, [0x3f] = 0x05, },

		{ {0x40, 0x0519} },

		.frag_data = { 0x19, 0x82 },

	},

	{

		"LD_IND word mixed head/frag",

		.u.insns = {

			BPF_STMT(BPF_LDX | BPF_IMM, 0x40),

			BPF_STMT(BPF_LD | BPF_IND | BPF_W, -0x2),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ [0x3e] = 0x25, [0x3f] = 0x05, },

		{ {0x40, 0x25051982} },

		.frag_data = { 0x19, 0x82 },

	},

	{

		"LD_ABS byte frag",

		.u.insns = {

			BPF_STMT(BPF_LD | BPF_ABS | BPF_B, 0x40),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ },

		{ {0x40, 0x42} },

		.frag_data = {

			0x42, 0x00, 0x00, 0x00,

			0x43, 0x44, 0x00, 0x00,

			0x21, 0x07, 0x19, 0x83,

		},

	},

	{

		"LD_ABS halfword frag",

		.u.insns = {

			BPF_STMT(BPF_LD | BPF_ABS | BPF_H, 0x44),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ },

		{ {0x40, 0x4344} },

		.frag_data = {

			0x42, 0x00, 0x00, 0x00,

			0x43, 0x44, 0x00, 0x00,

			0x21, 0x07, 0x19, 0x83,

		},

	},

	{

		"LD_ABS word frag",

		.u.insns = {

			BPF_STMT(BPF_LD | BPF_ABS | BPF_W, 0x48),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ },

		{ {0x40, 0x21071983} },

		.frag_data = {

			0x42, 0x00, 0x00, 0x00,

			0x43, 0x44, 0x00, 0x00,

			0x21, 0x07, 0x19, 0x83,

		},

	},

	{

		"LD_ABS halfword mixed head/frag",

		.u.insns = {

			BPF_STMT(BPF_LD | BPF_ABS | BPF_H, 0x3f),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ [0x3e] = 0x25, [0x3f] = 0x05, },

		{ {0x40, 0x0519} },

		.frag_data = { 0x19, 0x82 },

	},

	{

		"LD_ABS word mixed head/frag",

		.u.insns = {

			BPF_STMT(BPF_LD | BPF_ABS | BPF_W, 0x3e),

			BPF_STMT(BPF_RET | BPF_A, 0x0),

		},

		CLASSIC | FLAG_SKB_FRAG,

		{ [0x3e] = 0x25, [0x3f] = 0x05, },

		{ {0x40, 0x25051982} },

		.frag_data = { 0x19, 0x82 },

	},

};



static struct net_device dev;

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