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Date: Mon, 29 Aug 2016 15:23:36 -0700 From: Sargun Dhillon <sargun@...gun.me> To: Daniel Borkmann <daniel@...earbox.net> Cc: Daniel Mack <daniel@...que.org>, htejun@...com, ast@...com, davem@...emloft.net, kafai@...com, fw@...len.de, pablo@...filter.org, harald@...hat.com, netdev@...r.kernel.org Subject: Re: [PATCH v3 5/6] net: core: run cgroup eBPF egress programs On Tue, Aug 30, 2016 at 12:03:23AM +0200, Daniel Borkmann wrote: > On 08/26/2016 09:58 PM, Daniel Mack wrote: > >If the cgroup associated with the receiving socket has an eBPF > >programs installed, run them from __dev_queue_xmit(). > > > >eBPF programs used in this context are expected to either return 1 to > >let the packet pass, or != 1 to drop them. The programs have access to > >the full skb, including the MAC headers. > > > >Note that cgroup_bpf_run_filter() is stubbed out as static inline nop > >for !CONFIG_CGROUP_BPF, and is otherwise guarded by a static key if > >the feature is unused. > > > >Signed-off-by: Daniel Mack <daniel@...que.org> > >--- > > net/core/dev.c | 6 ++++++ > > 1 file changed, 6 insertions(+) > > > >diff --git a/net/core/dev.c b/net/core/dev.c > >index a75df86..17484e6 100644 > >--- a/net/core/dev.c > >+++ b/net/core/dev.c > >@@ -141,6 +141,7 @@ > > #include <linux/netfilter_ingress.h> > > #include <linux/sctp.h> > > #include <linux/crash_dump.h> > >+#include <linux/bpf-cgroup.h> > > > > #include "net-sysfs.h" > > > >@@ -3329,6 +3330,11 @@ static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv) > > if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP)) > > __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED); > > > >+ rc = cgroup_bpf_run_filter(skb->sk, skb, > >+ BPF_ATTACH_TYPE_CGROUP_INET_EGRESS); > >+ if (rc) > >+ return rc; > > This would leak the whole skb by the way. > > Apart from that, could this be modeled w/o affecting the forwarding path (at some > local output point where we know to have a valid socket)? Then you could also drop > the !sk and sk->sk_family tests, and we wouldn't need to replicate parts of what > clsact is doing as well. Hmm, maybe access to src/dst mac could be handled to be > just zeroes since not available at that point? > > > /* Disable soft irqs for various locks below. Also > > * stops preemption for RCU. > > */ > > Given this patchset only effects AF_INET, and AF_INET6, why not put the hooks at ip_output, and ip6_output
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