• John Fastabend's avatar
    bpf: sockmap redirect ingress support · 8934ce2f
    John Fastabend authored
    Add support for the BPF_F_INGRESS flag in sk_msg redirect helper.
    To do this add a scatterlist ring for receiving socks to check
    before calling into regular recvmsg call path. Additionally, because
    the poll wakeup logic only checked the skb recv queue we need to
    add a hook in TCP stack (similar to write side) so that we have
    a way to wake up polling socks when a scatterlist is redirected
    to that sock.
    After this all that is needed is for the redirect helper to
    push the scatterlist into the psock receive queue.
    Signed-off-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
    Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>