On 03/26/15 22:53, Alexei Starovoitov wrote:
existing TC action 'pedit' can munge any bits of the packet.
Generalize it for use in bpf programs attached as cls_bpf and act_bpf via
bpf_skb_store_bytes() helper function.
Signed-off-by: Alexei Starovoitov <redacted>
---
pedit is limited to 32-bit masked rewrites. Here let it be flexible.
ptr = skb_header_pointer(skb, offset, len, buf);
memcpy(ptr, from, len);
if (ptr == buf)
skb_store_bits(skb, offset, ptr, len);
^^ logic is the same as in pedit.
shifts, mask, invert style of rewrite is easily done by the program.
Just like arbitrary parsing of the packet and applying rewrites on demand.
Alexei/Daniel - I am backlogged on email; however, i didn quiet follow:
Is there another patch to pedit that help achieve the above?
cheers,
jamal