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net: add sock_set_reuseaddr

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Add a helper to directly set the SO_REUSEADDR sockopt from kernel space
without going through a fake uaccess.

For this the iscsi target now has to formally depend on inet to avoid
a mostly theoretical compile failure.  For actual operation it already
did depend on having ipv4 or ipv6 support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig
2020-05-28 07:12:09 +02:00
committed by David S. Miller
parent 1eba1110f0
commit b58f0e8f38
7 changed files with 19 additions and 34 deletions
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8
net/core/sock.c
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@@ -712,6 +712,14 @@ bool sk_mc_loop(struct sock *sk)
}
EXPORT_SYMBOL(sk_mc_loop);
void sock_set_reuseaddr(struct sock *sk)
{
lock_sock(sk);
sk->sk_reuse = SK_CAN_REUSE;
release_sock(sk);
}
EXPORT_SYMBOL(sock_set_reuseaddr);
/*
* This is meant for all protocols to use and covers goings on
* at the socket level. Everything here is generic.