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LXC: setup_netdev: re-read ifindex in LXC_NET_PHYS case

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Patch to fix interface netns transition when
assigning a physical interface to a container.
Pushed to the upstream LXC repo, to be included
in future versions of LXC.

Further details in included patch description.

Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
This commit is contained in:
Bogdan Purcareata 2013-11-14 18:04:40 +02:00 committed by Bruce Ashfield
parent a626d480cf
commit ad150f5655
2 changed files with 52 additions and 2 deletions
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49
recipes-containers/lxc/files/lxc-0.9.0-setup_netdev-re-read-ifindex-in-LXC_NET_PHYS-case.patch Normal file
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@ -0,0 +1,49 @@
From 8712c58ab896f072cf95e3ffa3ceac1fa10f6295 Mon Sep 17 00:00:00 2001
From: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Date: Thu, 14 Nov 2013 12:31:55 +0200
Subject: [PATCH] setup_netdev: re-read ifindex in LXC_NET_PHYS case
When moving an interface from the host netns to a container's,
the ifindex might not remain the same. This happens when the
index of the host interface is already assigned to another interface
in the new netns.
For veth/vlan/macvlan, virtual interfaces are first created on the host,
and then moved in the container. Since they are created after all other
interfaces are discovered, there is no chance for its assigned ifindex
to be already present in a freshly created netns, since its a greater
number.
However, when moving a physical interface, there is a chance that its
ifindex in the host netns is not free in the new netns. The patch
forces ifindex re-read for the LXC_NET_PHYS case to update the
lxc_netdev structure.
Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
---
src/lxc/conf.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/src/lxc/conf.c b/src/lxc/conf.c
index 6b3f318..08b0d0f 100644
--- a/src/lxc/conf.c
+++ b/src/lxc/conf.c
@@ -1846,6 +1846,14 @@ static int setup_netdev(struct lxc_netdev *netdev)
return 0;
}
+ /* get the new ifindex in case of physical netdev */
+ if (netdev->type == LXC_NET_PHYS)
+ if (!(netdev->ifindex = if_nametoindex(netdev->link))) {
+ ERROR("failed to get ifindex for %s",
+ netdev->link);
+ return -1;
+ }
+
/* retrieve the name of the interface */
if (!if_indextoname(netdev->ifindex, current_ifname)) {
ERROR("no interface corresponding to index '%d'",
--
1.7.11.7

5
recipes-containers/lxc/lxc_0.9.0.bb
View File

@ -24,8 +24,9 @@ RDEPENDS_${PN} = " \
SRC_URI = "http://linuxcontainers.org/downloads/${PN}-${PV}.tar.gz \
file://lxc-0.9.0-disable-udhcp-from-busybox-template.patch \
file://lxc-0.9.0-enable-chroot-chpasswd-functionality-for-busybox-hosts.patch \
file://lxc-0.9.0-check-when-bind-mounting-libdirs.patch \
file://lxc-0.9.0-don-t-let-LXC_PATH-end-in-failure.patch \
file://lxc-0.9.0-check-when-bind-mounting-libdirs.patch \
file://lxc-0.9.0-don-t-let-LXC_PATH-end-in-failure.patch \
file://lxc-0.9.0-setup_netdev-re-read-ifindex-in-LXC_NET_PHYS-case.patch \
"
SRC_URI[md5sum] = "8552a4479090616f4bc04d8473765fc9"
SRC_URI[sha256sum] = "1e1767eae6cc5fbf892c0e193d25da420ba19f2db203716c38f7cdea3b654120"