bpf: net: Add SO_DETACH_REUSEPORT_BPF

There is SO_ATTACH_REUSEPORT_[CE]BPF but there is no DETACH.
This patch adds SO_DETACH_REUSEPORT_BPF sockopt.  The same
sockopt can be used to undo both SO_ATTACH_REUSEPORT_[CE]BPF.

reseport_detach_prog() is added and it is mostly a mirror
of the existing reuseport_attach_prog().  The differences are,
it does not call reuseport_alloc() and returns -ENOENT when
there is no old prog.

Cc: Craig Gallek <kraig@google.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 75b1c950b49f..06be30737b69 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1045,6 +1045,10 @@ set_rcvbuf:
                 }
                 break;
 
+        case SO_DETACH_REUSEPORT_BPF:
+                ret = reuseport_detach_prog(sk);
+                break;
+
         case SO_DETACH_FILTER:
                 ret = sk_detach_filter(sk);
                 break;