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Re: BPF memstore and bpf_validate_ext()
Sorry for top-posting. I'm replying from my phone.
I've not looked at linux bpf before. I remember taking a quick look at
bpf_jit_compile function but I didn't like emitting binary machine code with
I spent few minutes today looking at linux code and I noticed few interesting
- They use negative offsets to access auxiliary data. So, there is a clear
distinction between local memory store and external data. I don't think it's a
new addition, though.
- They have a big enum of commands. Many of them translate to bpf commands but
there are also special commands like load protocol number into A. There is a
decoder from bpf but I have no clue how it works.
- Those commands are adapted to work with skbuf data.
20.12.13, 04:16, "David Laight" <david%l8s.co.uk@localhost>":
> On Fri, Dec 20, 2013 at 01:28:12AM +0200, Mindaugas Rasiukevicius wrote:
> > Alexander Nasonov <alnsn%yandex.ru@localhost> wrote:
> > >
> > > Well, if it wasn't needed for many year in bpf, why do we need it now? ;-)
> > >
> > Because it was decided to use BPF byte-code for more applications and that
> > meant there is a need for improvements. It is called evolution. :)
> Has anyone here looked closely at the changes linux is making to bpf?
> David Laight: david%l8s.co.uk@localhost
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