From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Jakub Sitnicki <jakub@cloudflare.com>
Cc: netdev@vger.kernel.org, bpf@vger.kernel.org,
dccp@vger.kernel.org, kernel-team@cloudflare.com,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Gerrit Renker <gerrit@erg.abdn.ac.uk>,
Jakub Kicinski <kuba@kernel.org>,
Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Martin KaFai Lau <kafai@fb.com>,
Marek Majkowski <marek@cloudflare.com>,
Lorenz Bauer <lmb@cloudflare.com>
Subject: Re: [PATCH bpf-next v2 05/17] inet: Run SK_LOOKUP BPF program on socket lookup
Date: Fri, 15 May 2020 08:07:42 -0700 [thread overview]
Message-ID: <20200515150742.obhv4sdps5chduay@ast-mbp> (raw)
In-Reply-To: <87wo5d2xht.fsf@cloudflare.com>
On Fri, May 15, 2020 at 02:28:30PM +0200, Jakub Sitnicki wrote:
> On Mon, May 11, 2020 at 10:44 PM CEST, Alexei Starovoitov wrote:
> > On Mon, May 11, 2020 at 08:52:06PM +0200, Jakub Sitnicki wrote:
> >> Run a BPF program before looking up a listening socket on the receive path.
> >> Program selects a listening socket to yield as result of socket lookup by
> >> calling bpf_sk_assign() helper and returning BPF_REDIRECT code.
> >>
> >> Alternatively, program can also fail the lookup by returning with BPF_DROP,
> >> or let the lookup continue as usual with BPF_OK on return.
> >>
> >> This lets the user match packets with listening sockets freely at the last
> >> possible point on the receive path, where we know that packets are destined
> >> for local delivery after undergoing policing, filtering, and routing.
> >>
> >> With BPF code selecting the socket, directing packets destined to an IP
> >> range or to a port range to a single socket becomes possible.
> >>
> >> Suggested-by: Marek Majkowski <marek@cloudflare.com>
> >> Reviewed-by: Lorenz Bauer <lmb@cloudflare.com>
> >> Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
> >> ---
>
> [...]
>
> > Also please switch to bpf_link way of attaching. All system wide attachments
> > should be visible and easily debuggable via 'bpftool link show'.
> > Currently we're converting tc and xdp hooks to bpf_link. This new hook
> > should have it from the beginning.
>
> Just to clarify, I understood that bpf(BPF_PROG_ATTACH/DETACH) doesn't
> have to be supported for new hooks.
Yes. Not only no need. I don't think attach/detach fits.
next prev parent reply other threads:[~2020-05-15 15:07 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-11 18:52 [PATCH bpf-next v2 00/17] Run a BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 01/17] flow_dissector: Extract attach/detach/query helpers Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 02/17] bpf: Introduce SK_LOOKUP program type with a dedicated attach point Jakub Sitnicki
2020-05-11 19:06 ` Jakub Sitnicki
2020-05-13 5:41 ` Martin KaFai Lau
2020-05-13 14:34 ` Jakub Sitnicki
2020-05-13 18:10 ` Martin KaFai Lau
2020-05-11 18:52 ` [PATCH bpf-next v2 03/17] inet: Store layer 4 protocol in inet_hashinfo Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 04/17] inet: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 05/17] inet: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 20:44 ` Alexei Starovoitov
2020-05-12 13:52 ` Jakub Sitnicki
2020-05-12 23:58 ` Alexei Starovoitov
2020-05-13 13:55 ` Jakub Sitnicki
2020-05-13 14:21 ` Lorenz Bauer
2020-05-13 14:50 ` Jakub Sitnicki
2020-05-15 12:28 ` Jakub Sitnicki
2020-05-15 15:07 ` Alexei Starovoitov [this message]
2020-05-11 18:52 ` [PATCH bpf-next v2 06/17] inet6: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 07/17] inet6: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 08/17] udp: Store layer 4 protocol in udp_table Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 09/17] udp: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 10/17] udp: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 11/17] udp6: Extract helper for selecting socket from reuseport group Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 12/17] udp6: Run SK_LOOKUP BPF program on socket lookup Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 13/17] bpf: Sync linux/bpf.h to tools/ Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 14/17] libbpf: Add support for SK_LOOKUP program type Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 15/17] selftests/bpf: Add verifier tests for bpf_sk_lookup context access Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 16/17] selftests/bpf: Rename test_sk_lookup_kern.c to test_ref_track_kern.c Jakub Sitnicki
2020-05-11 18:52 ` [PATCH bpf-next v2 17/17] selftests/bpf: Tests for BPF_SK_LOOKUP attach point Jakub Sitnicki
2020-05-11 19:45 ` [PATCH bpf-next v2 00/17] Run a BPF program on socket lookup Martin KaFai Lau
2020-05-12 11:57 ` Jakub Sitnicki
2020-05-12 16:34 ` Martin KaFai Lau
2020-05-13 17:54 ` Jakub Sitnicki
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