netdev - Re: running an eBPF program

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Message-ID: <CAH3MdRVk5J2T+L7wOg4FmkWiR58JNqUPTZ+Eq-ZzGhaKVMYJBQ@mail.gmail.com>
Date:   Sun, 28 May 2017 22:31:36 -0700
From:   Y Song <ys114321@...il.com>
To:     Adel Fuchs <adelfuchs@...il.com>
Cc:     netdev@...r.kernel.org
Subject: Re: running an eBPF program

On Sun, May 28, 2017 at 12:38 AM, Adel Fuchs <adelfuchs@...il.com> wrote:
> Hi,
> Is there any way to run this eBPF program without that patch?
> Alternatively, is there any other eBPF sample that does run properly? I need
> to run a program that filters packets according to IP address or port.

The following is temporary workaround you can use:
        int poff, nh_off = BPF_LL_OFF + ETH_HLEN;
-       __be16 proto = skb->protocol;
+       __be16 proto = (__be16)*(volatile __u32 *)&skb->protocol;
        __u8 ip_proto;