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bpf: wire in data and data_end for cls_act_bpf

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allow cls_bpf and act_bpf programs access skb->data and skb->data_end pointers.
The bpf helpers that change skb->data need to update data_end pointer as well.
The verifier checks that programs always reload data, data_end pointers
after calls to such bpf helpers.
We cannot add 'data_end' pointer to struct qdisc_skb_cb directly,
since it's embedded as-is by infiniband ipoib, so wrapper struct is needed.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexei Starovoitov
2016-05-05 19:49:12 -07:00
committed by David S. Miller
parent 735b433397
commit db58ba4592
4 changed files with 65 additions and 6 deletions
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2
net/sched/cls_bpf.c
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@@ -96,9 +96,11 @@ static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
if (at_ingress) {
/* It is safe to push/pull even if skb_shared() */
__skb_push(skb, skb->mac_len);
bpf_compute_data_end(skb);
filter_res = BPF_PROG_RUN(prog->filter, skb);
__skb_pull(skb, skb->mac_len);
} else {
bpf_compute_data_end(skb);
filter_res = BPF_PROG_RUN(prog->filter, skb);
}