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util: new function virNetDevGetMaster()

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This function provides the bridge/bond device that the given network
device is attached to. The return value is 0 or -1, and the master
device is a char** argument to the function - this is needed in order
to allow for a "success" return from a device that has no master.
This commit is contained in:
Laine Stump 2017-03-17 20:57:18 -04:00
parent 5a4a0db05a
commit e75f5bfbe8
3 changed files with 53 additions and 0 deletions
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1
src/libvirt_private.syms
View File

@ -1994,6 +1994,7 @@ virNetDevGetFeatures;
virNetDevGetIndex;
virNetDevGetLinkInfo;
virNetDevGetMAC;
virNetDevGetMaster;
virNetDevGetMTU;
virNetDevGetName;
virNetDevGetOnline;

49
src/util/virnetdev.c
View File

@ -979,6 +979,55 @@ int virNetDevGetIndex(const char *ifname ATTRIBUTE_UNUSED,
#endif /* ! SIOCGIFINDEX */
#if defined(__linux__) && defined(HAVE_LIBNL)
/**
* virNetDevGetMaster:
* @ifname: name of interface we're interested in
* @master: used to return a string containing the name of @ifname's "master"
* (this is the bridge or bond device that this device is attached to)
*
* Returns 0 on success, -1 on failure (if @ifname has no master
* @master will be NULL, but return value will still be 0 (success)).
*/
int
virNetDevGetMaster(const char *ifname, char **master)
{
int ret = -1;
void *nlData = NULL;
struct nlattr *tb[IFLA_MAX + 1] = {NULL, };
*master = NULL;
if (virNetlinkDumpLink(ifname, -1, &nlData, tb, 0, 0) < 0)
goto cleanup;
if (tb[IFLA_MASTER]) {
if (!(*master = virNetDevGetName(*(int *)RTA_DATA(tb[IFLA_MASTER]))))
goto cleanup;
}
ret = 0;
cleanup:
VIR_FREE(nlData);
return ret;
}
#else
int
virNetDevGetMaster(const char *ifname, char **master)
{
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Unable to get device master from netlink on this platform"));
return -1;
}
#endif /* defined(__linux__) && defined(HAVE_LIBNL) */
#if defined(SIOCGIFVLAN) && defined(HAVE_STRUCT_IFREQ) && HAVE_DECL_GET_VLAN_VID_CMD
int virNetDevGetVLanID(const char *ifname, int *vlanid)
{

3
src/util/virnetdev.h
View File

@ -165,6 +165,9 @@ int virNetDevGetIndex(const char *ifname, int *ifindex)
int virNetDevGetVLanID(const char *ifname, int *vlanid)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevGetMaster(const char *ifname, char **master)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_RETURN_CHECK;
int virNetDevValidateConfig(const char *ifname,
const virMacAddr *macaddr, int ifindex)
ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;