On Sun, Jan 24, 2021 at 6:14 AM Lukas Wunner <lukas@xxxxxxxxx> wrote: > > On Fri, Jan 22, 2021 at 11:13:19AM -0500, Willem de Bruijn wrote: > > On Fri, Jan 22, 2021 at 4:44 AM Lukas Wunner <lukas@xxxxxxxxx> wrote: > > > Add egress hook for AF_PACKET sockets that have the PACKET_QDISC_BYPASS > > > socket option set to on, which allows packets to escape without being > > > filtered in the egress path. > > > > > > This patch only updates the AF_PACKET path, it does not update > > > dev_direct_xmit() so the XDP infrastructure has a chance to bypass > > > Netfilter. > > > > Isn't the point of PACKET_QDISC_BYPASS to skip steps like this? > > I suppose PACKET_QDISC_BYPASS "was introduced to bypass qdisc, > not to bypass everything." > > (The quote is taken from this message by Eric Dumazet: > https://lore.kernel.org/netfilter-devel/a9006cf7-f4ba-81b1-fca1-fd2e97939fdc@xxxxxxxxx/ > ) I see. I don't understand the value of a short-cut fast path if we start chipping away at its characteristic feature. It also bypasses sch_handle_egress and packet sockets. This new feature seems broadly similar to the first?
