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authorLennart Poettering <lennart@poettering.net>2016-04-25 13:42:20 +0200
committerLennart Poettering <lennart@poettering.net>2016-04-25 13:44:24 +0200
commitef3b2aa7a16cae897390feda791675c9fb2e8116 (patch)
treed971c138bb0cbf5a421a6e4ebe7c41330685a361
parentfa647aa978a1fb6408798e365617529c2b7e53c7 (diff)
nspawn: explicitly remove veth links we created after use
Sometimes the kernel keeps veth links pinned after the namespace they have been joined to died. Let's hence explicitly remove veth links after use. Fixes: #2173
-rw-r--r--src/nspawn/nspawn-network.c47
-rw-r--r--src/nspawn/nspawn-network.h2
-rw-r--r--src/nspawn/nspawn.c2
3 files changed, 51 insertions, 0 deletions
diff --git a/src/nspawn/nspawn-network.c b/src/nspawn/nspawn-network.c
index 74a0ae865b..f2b7e4dd79 100644
--- a/src/nspawn/nspawn-network.c
+++ b/src/nspawn/nspawn-network.c
@@ -538,3 +538,50 @@ int veth_extra_parse(char ***l, const char *p) {
a = b = NULL;
return 0;
}
+
+static int remove_one_veth_link(sd_netlink *rtnl, const char *name) {
+ _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
+ int r;
+
+ if (isempty(name))
+ return 0;
+
+ r = sd_rtnl_message_new_link(rtnl, &m, RTM_DELLINK, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to allocate netlink message: %m");
+
+ r = sd_netlink_message_append_string(m, IFLA_IFNAME, name);
+ if (r < 0)
+ return log_error_errno(r, "Failed to add netlink interface name: %m");
+
+ r = sd_netlink_call(rtnl, m, 0, NULL);
+ if (r == -ENODEV) /* Already gone */
+ return 0;
+ if (r < 0)
+ return log_error_errno(r, "Failed to remove veth interface %s: %m", name);
+
+ return 1;
+}
+
+int remove_veth_links(const char *primary, char **pairs) {
+ _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL;
+ char **a, **b;
+ int r;
+
+ /* In some cases the kernel might pin the veth links between host and container even after the namespace
+ * died. Hence, let's better remove them explicitly too. */
+
+ if (isempty(primary) && strv_isempty(pairs))
+ return 0;
+
+ r = sd_netlink_open(&rtnl);
+ if (r < 0)
+ return log_error_errno(r, "Failed to connect to netlink: %m");
+
+ remove_one_veth_link(rtnl, primary);
+
+ STRV_FOREACH_PAIR(a, b, pairs)
+ remove_one_veth_link(rtnl, *a);
+
+ return 0;
+}
diff --git a/src/nspawn/nspawn-network.h b/src/nspawn/nspawn-network.h
index 9ab1606d1c..c5036ab470 100644
--- a/src/nspawn/nspawn-network.h
+++ b/src/nspawn/nspawn-network.h
@@ -34,3 +34,5 @@ int setup_ipvlan(const char *machine_name, pid_t pid, char **ifaces);
int move_network_interfaces(pid_t pid, char **ifaces);
int veth_extra_parse(char ***l, const char *p);
+
+int remove_veth_links(const char *primary, char **pairs);
diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c
index e1d37d383a..d687df8a09 100644
--- a/src/nspawn/nspawn.c
+++ b/src/nspawn/nspawn.c
@@ -3713,6 +3713,7 @@ int main(int argc, char *argv[]) {
}
expose_port_flush(arg_expose_ports, &exposed);
+ (void) remove_veth_links(veth_name, arg_network_veth_extra);
}
finish:
@@ -3745,6 +3746,7 @@ finish:
}
expose_port_flush(arg_expose_ports, &exposed);
+ (void) remove_veth_links(veth_name, arg_network_veth_extra);
free(arg_directory);
free(arg_template);