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From: David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
To: lorenzo-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org
Cc: daniel-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org,
	alexei.starovoitov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	daniel-cYrQPVfZoowdnm+yROfE0A@public.gmane.org,
	pablo-Cap9r6Oaw4JrovVCs/uTlw@public.gmane.org,
	htejun-b10kYP2dOMg@public.gmane.org,
	ast-b10kYP2dOMg@public.gmane.org,
	kafai-b10kYP2dOMg@public.gmane.org,
	fw-HFFVJYpyMKqzQB+pC5nmwQ@public.gmane.org,
	harald-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	sargun-GaZTRHToo+CzQB+pC5nmwQ@public.gmane.org,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v7 0/6] Add eBPF hooks for cgroups
Date: Tue, 01 Nov 2016 11:38:33 -0400 (EDT)	[thread overview]
Message-ID: <20161101.113833.983996221243204456.davem@davemloft.net> (raw)
In-Reply-To: <CAKD1Yr02SCHvd-xZJL14d_Ta8Dk4evHZ60zytpU0h4r80FucwA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

From: Lorenzo Colitti <lorenzo-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Date: Wed, 2 Nov 2016 00:25:15 +0900

> That way, if you want to modify the packet or do something
> sophisticated in netfilter, you can still use the eBPF hook on the
> results of that operation, and if you don't want to run netfilter, you
> can write netfilter rules to skip the packet (and maybe still fix it
> up later, perhaps in another netfilter chain).

The downside is that we classify the packet twice.  This transactional
cost adds up rather quickly.

      parent reply	other threads:[~2016-11-01 15:38 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-25 10:14 [PATCH v7 0/6] Add eBPF hooks for cgroups Daniel Mack
2016-10-25 10:14 ` [PATCH v7 1/6] bpf: add new prog type for cgroup socket filtering Daniel Mack
2016-10-25 10:14 ` [PATCH v7 4/6] net: filter: run cgroup eBPF ingress programs Daniel Mack
     [not found] ` <1477390454-12553-1-git-send-email-daniel-cYrQPVfZoowdnm+yROfE0A@public.gmane.org>
2016-10-25 10:14   ` [PATCH v7 2/6] cgroup: add support for eBPF programs Daniel Mack
2016-10-25 10:14   ` [PATCH v7 3/6] bpf: add BPF_PROG_ATTACH and BPF_PROG_DETACH commands Daniel Mack
2016-10-25 10:14   ` [PATCH v7 5/6] net: ipv4, ipv6: run cgroup eBPF egress programs Daniel Mack
2016-10-31 16:40     ` David Miller
     [not found]       ` <20161031.124003.1361406552151798940.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2016-11-02  1:17         ` Daniel Borkmann
2016-10-25 10:14   ` [PATCH v7 6/6] samples: bpf: add userspace example for attaching eBPF programs to cgroups Daniel Mack
2016-10-26 19:59 ` [PATCH v7 0/6] Add eBPF hooks for cgroups Pablo Neira Ayuso
2016-10-27  3:35   ` Alexei Starovoitov
     [not found]     ` <20161027033502.GA43960-+o4/htvd0TDFYCXBM6kdu7fOX0fSgVTm@public.gmane.org>
2016-10-28 11:28       ` Pablo Neira Ayuso
2016-10-28 15:00         ` David Ahern
2016-10-29  1:42         ` Alexei Starovoitov
2016-10-27  8:40   ` Daniel Mack
     [not found]     ` <c9683122-d770-355b-e275-7c446e6d1d0f-cYrQPVfZoowdnm+yROfE0A@public.gmane.org>
2016-10-28 11:53       ` Pablo Neira Ayuso
2016-10-28 12:07         ` Daniel Mack
2016-10-29  3:51       ` Lorenzo Colitti
     [not found]         ` <CAKD1Yr2aRDNUxX8onReZyURufphxGoSTek=Fjk3Wswq9WOVp4w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-10-29  4:51           ` Alexei Starovoitov
     [not found]             ` <20161029045107.GA61294-+o4/htvd0TDFYCXBM6kdu7fOX0fSgVTm@public.gmane.org>
2016-10-29  4:59               ` Lorenzo Colitti
     [not found]                 ` <CAKD1Yr2pMk52h7BdRwTvGwnP5+ONmr4ac6cyUBoZ9P+Kt-B8jw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-10-29  6:24                   ` Alexei Starovoitov
2016-10-29 15:34                     ` Lorenzo Colitti
2016-10-29 20:29                       ` Daniel Borkmann
2016-11-01 15:25                         ` Lorenzo Colitti
     [not found]                           ` <CAKD1Yr02SCHvd-xZJL14d_Ta8Dk4evHZ60zytpU0h4r80FucwA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-11-01 15:38                             ` David Miller [this message]

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