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Allow to set ifmode for existing DCO interfaces in FreeBSD

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While prexisting devices work well TUN/TAP the DCO interfaces require
setting the ifmode which cannot be done by FreeBSD base tooling.  In
peer-to-peer mode this is not a problem because that is the default mode.
Subnet mode, however, will fail to be set and the resulting connection does
not start:

  Failed to create interface ovpns2 (SIOCSIFNAME): File exists (errno=17)
  DCO device ovpns2 already exists, won't be destroyed at shutdown
  /sbin/ifconfig ovpns2 10.1.8.1/24 mtu 1500 up
  ifconfig: in_exec_nl(): Empty IFA_LOCAL/IFA_ADDRESS
  ifconfig: ioctl (SIOCAIFADDR): Invalid argument
  FreeBSD ifconfig failed: external program exited with error status: 1
  Exiting due to fatal error

Slightly restructure the code to catch the specific error
condition and execute dco_set_ifmode() in this case as well.

Signed-off-by: Franco Fichtner <franco@opnsense.org>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <AE20A784-506C-488B-9302-2D3AE775B168@opnsense.org>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg28688.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
This commit is contained in:
Franco Fichtner 2024-05-28 17:42:52 +00:00 committed by Gert Doering
parent fbe3b49b37
commit 82036c17c4
1 changed files with 17 additions and 11 deletions
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28
src/openvpn/dco_freebsd.c
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@ -219,6 +219,9 @@ create_interface(struct tuntap *tt, const char *dev)
{
ifr.ifr_data = (char *)dev;
}
snprintf(tt->dco.ifname, IFNAMSIZ, "%s", ifr.ifr_data);
ret = ioctl(tt->dco.fd, SIOCSIFNAME, &ifr);
if (ret)
{
@ -229,16 +232,6 @@ create_interface(struct tuntap *tt, const char *dev)
return ret;
}
snprintf(tt->dco.ifname, IFNAMSIZ, "%s", ifr.ifr_data);
/* see "Interface Flags" in ifnet(9) */
int i = IFF_POINTOPOINT | IFF_MULTICAST;
if (tt->topology == TOP_SUBNET)
{
i = IFF_BROADCAST | IFF_MULTICAST;
}
dco_set_ifmode(&tt->dco, i);
return 0;
}
@ -265,7 +258,20 @@ remove_interface(struct tuntap *tt)
int
open_tun_dco(struct tuntap *tt, openvpn_net_ctx_t *ctx, const char *dev)
{
return create_interface(tt, dev);
int ret = create_interface(tt, dev);
if (ret >= 0 || ret == -EEXIST)
{
/* see "Interface Flags" in ifnet(9) */
int i = IFF_POINTOPOINT | IFF_MULTICAST;
if (tt->topology == TOP_SUBNET)
{
i = IFF_BROADCAST | IFF_MULTICAST;
}
dco_set_ifmode(&tt->dco, i);
}
return ret;
}
void