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bpf: Align packet data properly in program testing framework. 

Make sure we apply NET_IP_ALIGN when reserving headroom for SKB
and XDP test runs, just like a real driver would.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
David Miller 2017-05-02 11:36:45 -04:00 committed by David S. Miller
parent 78e5227237
commit 586f852597
1 changed files with 5 additions and 5 deletions
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10
net/bpf/test_run.c
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@ -100,7 +100,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
void *data;
int ret;
data = bpf_test_init(kattr, size, NET_SKB_PAD,
data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
if (IS_ERR(data))
return PTR_ERR(data);
@ -125,7 +125,7 @@ int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
return -ENOMEM;
}
skb_reserve(skb, NET_SKB_PAD);
skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
__skb_put(skb, size);
skb->protocol = eth_type_trans(skb, current->nsproxy->net_ns->loopback_dev);
skb_reset_network_header(skb);
@ -156,16 +156,16 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
void *data;
int ret;
data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM, 0);
data = bpf_test_init(kattr, size, XDP_PACKET_HEADROOM + NET_IP_ALIGN, 0);
if (IS_ERR(data))
return PTR_ERR(data);
xdp.data_hard_start = data;
xdp.data = data + XDP_PACKET_HEADROOM;
xdp.data = data + XDP_PACKET_HEADROOM + NET_IP_ALIGN;
xdp.data_end = xdp.data + size;
retval = bpf_test_run(prog, &xdp, repeat, &duration);
if (xdp.data != data + XDP_PACKET_HEADROOM)
if (xdp.data != data + XDP_PACKET_HEADROOM + NET_IP_ALIGN)
size = xdp.data_end - xdp.data;
ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
kfree(data);