Skip to content

Commit

Permalink
test_bpf: add more tests for LD_ABS and LD_IND.
Browse files Browse the repository at this point in the history 
This exerces the LD_ABS and LD_IND instructions for various sizes and
alignments. This also checks that X when used as an offset to a
BPF_IND instruction first in a filter is correctly set to 0.

Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
  • Loading branch information
Nicolas Schichan authored and David S. Miller committed Aug 7, 2015
1 parent d2648d4 commit 08fcb08
Showing 1 changed file with 296 additions and 0 deletions.
296 changes: 296 additions & 0 deletions lib/test_bpf.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -4635,6 +4635,302 @@ static struct bpf_test tests[] = {
{ {0x40, 0x25051982} },
.frag_data = { 0x19, 0x82 },
},
/*
* LD_IND / LD_ABS on non fragmented SKBs
*/
{
/*
* this tests that the JIT/interpreter correctly resets X
* before using it in an LD_IND instruction.
*/
"LD_IND byte default X",
.u.insns = {
BPF_STMT(BPF_LD | BPF_IND | BPF_B, 0x1),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{ [0x1] = 0x42 },
{ {0x40, 0x42 } },
},
{
"LD_IND byte positive offset",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x3e),
BPF_STMT(BPF_LD | BPF_IND | BPF_B, 0x1),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{ [0x3c] = 0x25, [0x3d] = 0x05, [0x3e] = 0x19, [0x3f] = 0x82 },
{ {0x40, 0x82 } },
},
{
"LD_IND byte negative offset",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x3e),
BPF_STMT(BPF_LD | BPF_IND | BPF_B, -0x1),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{ [0x3c] = 0x25, [0x3d] = 0x05, [0x3e] = 0x19, [0x3f] = 0x82 },
{ {0x40, 0x05 } },
},
{
"LD_IND halfword positive offset",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_H, 0x2),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
},
{ {0x40, 0xdd88 } },
},
{
"LD_IND halfword negative offset",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_H, -0x2),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
},
{ {0x40, 0xbb66 } },
},
{
"LD_IND halfword unaligned",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_H, -0x1),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
},
{ {0x40, 0x66cc } },
},
{
"LD_IND word positive offset",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_W, 0x4),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0xee99ffaa } },
},
{
"LD_IND word negative offset",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_W, -0x4),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0xaa55bb66 } },
},
{
"LD_IND word unaligned (addr & 3 == 2)",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_W, -0x2),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0xbb66cc77 } },
},
{
"LD_IND word unaligned (addr & 3 == 1)",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_W, -0x3),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0x55bb66cc } },
},
{
"LD_IND word unaligned (addr & 3 == 3)",
.u.insns = {
BPF_STMT(BPF_LDX | BPF_IMM, 0x20),
BPF_STMT(BPF_LD | BPF_IND | BPF_W, -0x1),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0x66cc77dd } },
},
{
"LD_ABS byte",
.u.insns = {
BPF_STMT(BPF_LD | BPF_ABS | BPF_B, 0x20),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0xcc } },
},
{
"LD_ABS halfword",
.u.insns = {
BPF_STMT(BPF_LD | BPF_ABS | BPF_H, 0x22),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0xdd88 } },
},
{
"LD_ABS halfword unaligned",
.u.insns = {
BPF_STMT(BPF_LD | BPF_ABS | BPF_H, 0x25),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0x99ff } },
},
{
"LD_ABS word",
.u.insns = {
BPF_STMT(BPF_LD | BPF_ABS | BPF_W, 0x1c),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0xaa55bb66 } },
},
{
"LD_ABS word unaligned (addr & 3 == 2)",
.u.insns = {
BPF_STMT(BPF_LD | BPF_ABS | BPF_W, 0x22),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0xdd88ee99 } },
},
{
"LD_ABS word unaligned (addr & 3 == 1)",
.u.insns = {
BPF_STMT(BPF_LD | BPF_ABS | BPF_W, 0x21),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0x77dd88ee } },
},
{
"LD_ABS word unaligned (addr & 3 == 3)",
.u.insns = {
BPF_STMT(BPF_LD | BPF_ABS | BPF_W, 0x23),
BPF_STMT(BPF_RET | BPF_A, 0x0),
},
CLASSIC,
{
[0x1c] = 0xaa, [0x1d] = 0x55,
[0x1e] = 0xbb, [0x1f] = 0x66,
[0x20] = 0xcc, [0x21] = 0x77,
[0x22] = 0xdd, [0x23] = 0x88,
[0x24] = 0xee, [0x25] = 0x99,
[0x26] = 0xff, [0x27] = 0xaa,
},
{ {0x40, 0x88ee99ff } },
},
};

static struct net_device dev;
Expand Down

0 comments on commit 08fcb08

Please sign in to comment.