On Sun, Nov 11, 2018 at 11:15 PM Anand H. Krishnan <anandhkrish...@gmail.com> wrote: > > Hello, > > We are seeing a problem with AF_PACKET when used along with the > veth interfaces. SCP complains that message authentication code is > incorrect. > > I was browsing the code and I see that veth_xmit calls ____dev_forward_skb > which does a skb_scrub_packet, which in turn calls the skb destructor > function.
Where does it call this? On the other hand, it is likely that skb_orphan() is called somewhere on the receive path, which indeed will release the tx_ring slot. > skb_orphan_frags, called by ____dev_forward_skb, seems to do the right thing, > but it probably does not get called for packets from AF_PACKET socket, since > the > skb is not a zero copy skb (SKBTX_DEV_ZEROCOPY is not set). Yes, an skb_copy_ubufs may be needed if the orphan is unavoidable.
