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net: handle ARPHRD_PPP in dev_is_mac_header_xmit()
commita4f39c9f14
upstream. The goal is to support a bpf_redirect() from an ethernet device (ingress) to a ppp device (egress). The l2 header is added automatically by the ppp driver, thus the ethernet header should be removed. CC: stable@vger.kernel.org Fixes:27b29f6305
("bpf: add bpf_redirect() helper") Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Tested-by: Siwar Zitouni <siwar.zitouni@6wind.com> Reviewed-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -53,6 +53,10 @@ static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
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case ARPHRD_NONE:
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case ARPHRD_RAWIP:
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case ARPHRD_PIMREG:
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/* PPP adds its l2 header automatically in ppp_start_xmit().
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* This makes it look like an l3 device to __bpf_redirect() and tcf_mirred_init().
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*/
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case ARPHRD_PPP:
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return false;
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default:
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return true;
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