Commit d50bc157 authored May 29, 2014 by Daniel Borkmann Committed by David S. Miller Jun 01, 2014

net: filter: add test for loading SKF_AD_OFF limits



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>

parent 9fe13baa

lib/test_bpf.c

+22 −0

Original line number	Diff line number	Diff line
		@@ -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;