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Revert "net: do not allow changing SO_REUSEADDR/SO_REUSEPORT on bound sockets"

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Revert the patch mentioned in the subject because it breaks at least
the Avahi mDNS daemon. That patch namely causes the Ubuntu 18.04 Avahi
daemon to fail to start:

Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: Successfully called chroot().
Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: Successfully dropped remaining capabilities.
Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: No service file found in /etc/avahi/services.
Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: SO_REUSEADDR failed: Structure needs cleaning
Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: SO_REUSEADDR failed: Structure needs cleaning
Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: Failed to create server: No suitable network protocol available
Jun 12 09:49:24 ubuntu-vm avahi-daemon[529]: avahi-daemon 0.7 exiting.
Jun 12 09:49:24 ubuntu-vm systemd[1]: avahi-daemon.service: Main process exited, code=exited, status=255/n/a
Jun 12 09:49:24 ubuntu-vm systemd[1]: avahi-daemon.service: Failed with result 'exit-code'.
Jun 12 09:49:24 ubuntu-vm systemd[1]: Failed to start Avahi mDNS/DNS-SD Stack.

Fixes: f396922d86 ("net: do not allow changing SO_REUSEADDR/SO_REUSEPORT on bound sockets")
Cc: Maciej Żenczykowski <maze@google.com>
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bart Van Assche 2018-06-12 10:05:55 -07:00 committed by David S. Miller
parent 6892286e9c
commit cdb8744d80
1 changed files with 1 additions and 14 deletions
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15
net/core/sock.c
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@ -728,22 +728,9 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
sock_valbool_flag(sk, SOCK_DBG, valbool);
break;
case SO_REUSEADDR:
val = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
if ((sk->sk_family == PF_INET || sk->sk_family == PF_INET6) &&
inet_sk(sk)->inet_num &&
(sk->sk_reuse != val)) {
ret = (sk->sk_state == TCP_ESTABLISHED) ? -EISCONN : -EUCLEAN;
break;
}
sk->sk_reuse = val;
sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE);
break;
case SO_REUSEPORT:
if ((sk->sk_family == PF_INET || sk->sk_family == PF_INET6) &&
inet_sk(sk)->inet_num &&
(sk->sk_reuseport != valbool)) {
ret = (sk->sk_state == TCP_ESTABLISHED) ? -EISCONN : -EUCLEAN;
break;
}
sk->sk_reuseport = valbool;
break;
case SO_TYPE: