bpf: sockmap redirect ingress support

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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: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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John Fastabend 2018-03-28 12:49:15 -07:00 • committed by Daniel Borkmann

parent 22527437e0

commit 8934ce2fd0

5 changed files with 207 additions and 5 deletions

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1

include/linux/filter.h

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1

include/net/sock.h

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