Revision 5fdcce211b3a41c3fed229333027f59a94a2f265 authored by William Dauchy on 13 February 2020, 17:19:22 UTC, committed by David S. Miller on 14 February 2020, 15:31:48 UTC
With ipip, it is possible to create an extra interface explicitly attached to a given physical interface: # ip link show tunl0 4: tunl0@NONE: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ipip 0.0.0.0 brd 0.0.0.0 # ip link add tunl1 type ipip dev eth0 # ip link show tunl1 6: tunl1@eth0: <NOARP> mtu 1480 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/ipip 0.0.0.0 brd 0.0.0.0 But it is not possible with ip6tnl: # ip link show ip6tnl0 5: ip6tnl0@NONE: <NOARP> mtu 1452 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/tunnel6 :: brd :: # ip link add ip6tnl1 type ip6tnl dev eth0 RTNETLINK answers: File exists This patch aims to make it possible by adding link comparaison in both tunnel locate and lookup functions; we also modify mtu calculation when attached to an interface with a lower mtu. This permits to make use of x-netns communication by moving the newly created tunnel in a given netns. Signed-off-by: William Dauchy <w.dauchy@criteo.com> Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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COPYING
The Linux Kernel is provided under:
SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
Being under the terms of the GNU General Public License version 2 only,
according with:
LICENSES/preferred/GPL-2.0
With an explicit syscall exception, as stated at:
LICENSES/exceptions/Linux-syscall-note
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Documentation/process/license-rules.rst
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