So actually, come to think of it ...
> > The mapping in samples/bpf/bpf_helpers.h, for example, for
> > mentioned
> > bpf_skb_load_bytes() would also work out of the box, since it takes
> > a
> > void *ctx as an argument, so you can just pass the __wifi_sk_buff
> > pointer as ctx there from progra
On Tue, 2017-04-18 at 12:58 +0200, Daniel Borkmann wrote:
>
> Note that for skbs the data / data_end model (aka direct read /
> write) is also supported. There's also a bpf_skb_pull_data() helper
> that pulls in data from non-linear parts if necessary (f.e. if data /
> data_end test in the program
On 04/18/2017 11:55 AM, Johannes Berg wrote:
On Fri, 2017-04-14 at 11:51 -0700, Alexei Starovoitov wrote:
so today only 'len' field is needed,
Correct, the other __sk_buff fields don't apply.
It's more of an XDP model (with data/data_end), but as the SKB might be
non-linear at this point I p
On Fri, 2017-04-14 at 11:51 -0700, Alexei Starovoitov wrote:
>
> so today only 'len' field is needed,
Correct, the other __sk_buff fields don't apply.
It's more of an XDP model (with data/data_end), but as the SKB might be
non-linear at this point I prefer to have the SKB so that skb data
access
On Wed, Apr 12, 2017 at 05:30:40PM +0200, Johannes Berg wrote:
> On Wed, 2017-04-12 at 11:19 -0400, David Miller wrote:
> >
> > > Instead it may make more sense to just have a "wifi_info(skb,
> > info)"
> > > function you can call, e.g. with a structure that has various
> > fields
> > > and flags
Hi Johannes,
> Add a new program type for wifi monitor interfaces. This program
> type can
> * access __sk_buff, but only skb->len
> * call bpf_skb_load_bytes()
>
> The program type is only enabled when something selects the new
> Kconfig symbol WANT_BPF_WIFIMON, which will be done by mac80211
>
On Wed, 2017-04-12 at 11:19 -0400, David Miller wrote:
>
> > Instead it may make more sense to just have a "wifi_info(skb,
> info)"
> > function you can call, e.g. with a structure that has various
> fields
> > and flags to see which you care about.
>
> I would advise against this, let the parsin
From: Johannes Berg
Date: Wed, 12 Apr 2017 16:27:34 +0200
> This works. An example BPF program is here:
> https://p.sipsolutions.net/ca32264f2b705e5e.txt
...
> One thing I'm not so sure about is the usage of __sk_buff.
...
> Instead it may make more sense to just have a "wifi_info(skb, info)"
>
On Wed, 2017-04-12 at 13:07 +0200, Johannes Berg wrote:
> From: Johannes Berg
>
> Add a new program type for wifi monitor interfaces. This program
> type can
> * access __sk_buff, but only skb->len
> * call bpf_skb_load_bytes()
>
> The program type is only enabled when something selects the ne
From: Johannes Berg
Add a new program type for wifi monitor interfaces. This program
type can
* access __sk_buff, but only skb->len
* call bpf_skb_load_bytes()
The program type is only enabled when something selects the new
Kconfig symbol WANT_BPF_WIFIMON, which will be done by mac80211
in a f
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