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net: filter: add test for loading SKF_AD_OFF limits

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This check tests that overloading BPF_LD | BPF_ABS with an
always invalid BPF extension, that is SKF_AD_MAX, fails to
make sure classic BPF behaviour is correct in filter checker.

Also, we add a test for loading at packet offset SKF_AD_OFF-1
which should pass the filter, but later on fail during runtime.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2014-05-29 10:22:49 +02:00 committed by David S. Miller
parent 9fe13baad6
commit d50bc15750
1 changed files with 22 additions and 0 deletions
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22
lib/test_bpf.c
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@ -1655,6 +1655,28 @@ static struct bpf_test tests[] = {
{ },
{ { 0, 0x2a5a5e5 } },
},
{
"check: SKF_AD_MAX",
.u.insns = {
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
SKF_AD_OFF + SKF_AD_MAX),
BPF_STMT(BPF_RET | BPF_A, 0),
},
CLASSIC | FLAG_NO_DATA | FLAG_EXPECTED_FAIL,
{ },
{ },
},
{ /* Passes checker but fails during runtime. */
"LD [SKF_AD_OFF-1]",
.u.insns = {
BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
SKF_AD_OFF - 1),
BPF_STMT(BPF_RET | BPF_K, 1),
},
CLASSIC,
{ },
{ { 1, 0 } },
},
};
static struct net_device dev;