af_unix: Implement unix_dgram_bpf_recvmsg()

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We have to implement unix_dgram_bpf_recvmsg() to replace the
original ->recvmsg() to retrieve skmsg from ingress_msg.

AF_UNIX is again special here because the lack of
sk_prot->recvmsg(). I simply add a special case inside
unix_dgram_recvmsg() to call sk->sk_prot->recvmsg() directly.

Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210704190252.11866-8-xiyou.wangcong@gmail.com

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Cong Wang 2021-07-04 12:02:48 -07:00 • committed by Alexei Starovoitov

parent c63829182c

commit 9825d866ce

3 changed files with 93 additions and 3 deletions

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2

include/net/af_unix.h

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19

net/unix/af_unix.c

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75

net/unix/unix_bpf.c

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