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[LXC] Detect support for NETNS in lxc driver initialization

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Allow check for containers support to be done without CLONE_NEWNET, and then
determine support on the fly by checking for iproute2 support and a
successful clone(CLONE_NEWNET).  This lets us set a flag for later, as well
as not completely disable LXC support on a system without NETNS support.
This commit is contained in:
Dan Smith 2008-06-26 16:05:02 +00:00
parent f3c3550771
commit 99ded85f45
2 changed files with 25 additions and 4 deletions
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1
src/lxc_conf.h
View File

@ -89,6 +89,7 @@ struct __lxc_driver {
int ninactivevms;
char* configDir;
char* stateDir;
int have_netns;
};
/* Types and structs */

28
src/lxc_driver.c
View File

@ -66,6 +66,9 @@
#ifndef CLONE_NEWIPC
#define CLONE_NEWIPC 0x08000000
#endif
#ifndef CLONE_NEWNET
#define CLONE_NEWNET 0x40000000 /* New network namespace */
#endif
static int lxcStartup(void);
static int lxcShutdown(void);
@ -77,11 +80,11 @@ static int lxcDummyChild( void *argv ATTRIBUTE_UNUSED )
exit(0);
}
static int lxcCheckContainerSupport( void )
static int lxcCheckContainerSupport(int extra_flags)
{
int rc = 0;
int flags = CLONE_NEWPID|CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWUSER|
CLONE_NEWIPC|SIGCHLD;
CLONE_NEWIPC|SIGCHLD|extra_flags;
int cpid;
char *childStack;
char *stack;
@ -112,7 +115,7 @@ check_complete:
static const char *lxcProbe(void)
{
#ifdef __linux__
if (0 == lxcCheckContainerSupport()) {
if (0 == lxcCheckContainerSupport(0)) {
return("lxc:///");
}
#endif
@ -1039,6 +1042,22 @@ error_out:
return rc;
}
static int lxcCheckNetNsSupport(void)
{
const char *argv[] = {"ip", "link", "set", "lo", "netns", "-1", NULL};
int ip_rc;
int user_netns = 0;
int kern_netns = 0;
if (virRun(NULL, (char **)argv, &ip_rc) == 0)
user_netns = WIFEXITED(ip_rc) && (WEXITSTATUS(ip_rc) != 255);
if (lxcCheckContainerSupport(CLONE_NEWNET) == 0)
kern_netns = 1;
return kern_netns && user_netns;
}
static int lxcStartup(void)
{
uid_t uid = getuid();
@ -1053,10 +1072,11 @@ static int lxcStartup(void)
}
/* Check that this is a container enabled kernel */
if(0 != lxcCheckContainerSupport()) {
if(0 != lxcCheckContainerSupport(0)) {
return -1;
}
lxc_driver->have_netns = lxcCheckNetNsSupport();
/* Call function to load lxc driver configuration information */
if (lxcLoadDriverConfig(lxc_driver) < 0) {